Lamkin Grips


I recently had a chance to test a putting analyzer from 3Bays called the GSA PUTT. After it was written and published, the company asked that I take a look at their full swing analyzer, named the GSA PRO. The two devices share some similarities in how they operate, present information, and what information they present, so I’d recommend taking a look at my review on the PUTT for a little more information on the company and their offerings. Unlike the GSA PUTT, which I reviewed for the iOS operating system, I was able to test the PRO on my preferred Android platform.

GSA PRO Technical Specs

At one third of an ounce, 3BaysGSA PRO is the World’s Lightest Golf Swing Analyzer*, which fits perfectly to the end of golf club and uses advanced motion sensors to digitize your swing motion instantly and deliver real-time animated swing plane playback along with key swing metrics to your mobile devices via GSA PRO app. Golfers can compare each swing with their best ones or instructors’ so they can identify flaws, make adjustments and track the improvement progress. 3BaysGSA PRO is a revolutionary swing training aid that helps golfers pursue more powerful, accurate and consistent swings.


  • 29.3 x 18 mm (excluding pin)
  • 29.3 x 43 mm (including pin)


  • 9.8g

Play Time

  • Up to 5 hours


  • Version 2.1 + EDR

USB Port

  • Micro USB for charging

Compatible Devices

  • iPhone 3GS, 4, 4S, 5
  • iPod touch (4th,5th generation )
  • iPad, iPad2, new iPad, iPad4, iPad mini( requires iOS 4.3 or later )
  • Android devices with Bluetooth (requires Android 2.3 or later)

Dedicated App

  • GSA PRO on App Store or Google Play

 How it Works

The GSA PRO works identically to the GSA PUTT. The first step is downloading the app from either the App Store or Play Store (depending on your device of choice). The PRO device itself is inserted into the butt end of the grip on your golf club and connects with the app on your phone via Bluetooth connection. Set up is very simple by following the directions that are included in the package. I personally felt like the set up for the PRO using an Android device was easier than using the PUTT on iOS, but not by a large margin.

There are some additional steps involved to ensure accurate readings when using the PRO. First of all, you’ll want to go the settings menu and make sure the lengths listed for each club match the lengths of your set. I do want to note that the Android version does not offer the ability to choose lofts for your clubs. There are a number of other settings that can fine tune the experience for you, so definitely take the time to explore before swinging away.

At that point, all that is left to do is pick the club you are hitting and start taking swings. Assuming you have a clear view of your mobile device, the app will register your swing within seconds after impact. You can take a look at the results at that point in time, or take multiple swings and flip through each one after you are done. In addition to the number readouts, each shot is displayed in a graphical representation that can be animated at a variety of speeds.

I should note that the device itself weighs next to nothing, which is a big benefit. However, I did feel like it was somewhat obstructive (at least mentally) when taking swings. Though it sits at the very butt end of the grip, I did feel like I was going to brush it at times. The fact is that I never did have a situation where that occurred, but my mind made me feel as if I was going to.

One feature that I found useful was the ability to compare my swing with a professional’s in real time. The swing paths and metrics of both the professional’s and my swing were displayed immediately after each swing. There is also the option to save that ‘perfect’ swing and use it to compare against everything else.

What does it Track?

The GSA PRO tracks ten metrics and I’ve included a summary of each one.

  • Club Head Speed – The speed the club is traveling at impact.
  • Face Angle – The angle of the club face at impact – relative to face angle at address.
  • Swing Path – Where the downswing is relative to the backswing path.
  • Tempo – A ratio that shows backswing time relative to downswing time. A 3:1 ratio is generally accepted as ideal.
  • Back Swing Time – Time from address to top of backswing.
  • Down Swing Time – Time from top of backswing to impact.
  • Impact Force – This presents the amount of force (in lbs or kg) when you hit the ball.
  • Ball Speed – A mathematical representation of the speed of the ball after impact.
  • Carry Distance – A mathematical representation of the potential distance for a shot, assuming contact is in the center of the face.
  • Consistency – A measurement of how well each swing matches your best swing, or that of the professional.

What does it Mean?

In the GSA PUTT review I mentioned there were a number of metrics displayed that weren’t exactly things that most golfers would be familiar enough with to self-diagnose. I didn’t feel that way as much with the PRO, mainly because there is a lot more common knowledge out there in regards to the full swing. I felt like I had a good handle on everything that I was seeing, though the question does remain – how do I fix the problems I see? I do think that’s a spot where devices like this fall short. Some things are easy to spot and not so hard to diagnose, but others are probably best left to a professional. I’ll give some examples.

In this swing you can see that my back swing (blue line) is substantially longer than the pro’s (green line).

This is a problem I’ve known about and attempted to work on for a very long time, but it’s difficult to get instant feedback without video recording. In this case, the GSA PRO was quite helpful. By the end of testing I was able to get the end of the blue line around the top of the right shoulder instead of mid-back. While not as good as the professional’s, it was a big improvement that has paid off for me on the golf course.

These are representations of the rest of our swings, from both the head on and down the line views.

As you can see, my path is wider on the down swing, but my follow through is narrower than the pro’s. Looking at the swing from the down-the-line view showed me that while I was usually inside to square on my downswing, I was nowhere near as far inside as the pro. The problem is that I don’t know how to fix this, other than seeking the advice of my instructor. In fact, my feeling is that I’d do more harm than good trying to fix an issue like this on my own.

In summary, there is some valuable information available to users of the GSA PRO, but it does have limits. If you lack the ability to self-diagnose and prescribe yourself a cure, I’d probably lean towards recommend seeing a professional. That does bring up a suggestion for improvement with the PRO – individualized feedback from the professionals for certain swing flaws based off what is show on the app could benefit many users.


I’m going to discuss accuracy in two ways. First, in regards to the swing path that is shown on the visual display, and second, the accuracy of the numbers presented.

My perception was that the swing path and club face angle readings were accurate. I tested this with both my normal swing and by exaggerating misses like a big over the top move or an open face. To further bolster my feeling that I was getting accurate information here, the aforementioned long backswing was right in line with what I’ve seen on video when I’m at a golf lesson.

I did feel like I saw some inaccuracies with the swing speed and distance related readings. Let me first say that I’ve had the luxury of spending hours upon hours hitting balls on different types of launch monitors, so I do have a good handle on what my normal numbers are for different clubs. After some time testing it, I felt like the GSA PRO was registering lower than I expected, but I wasn’t quite sure. To test this I took a laser rangefinder with me to the driving range for some practice. I set up to a flag at 142 yards, grabbed my 9 iron, and selected it as the club I was using on the app. What I noticed was a discrepancy of approximately 15 yards in the “Distance” reading, with my shots landing right at the flag and the app recording them as flying in the mid 120’s. In addition, my swing speed and ball speed were registering much lower than would have been needed to hit a nine iron that distance. I did mention that there isn’t an option to pick the loft of your club on the Android version, but I did have the correct length chosen. I will say that I felt like this was a pretty substantial issue, as it did leave me doubting my abilities on a couple occasions that I didn’t have the option to laser the flags I was aiming at. It was somewhat disconcerting to see numbers telling me my swing speed was significantly lower than normal.   I wonder if a loft selection feature would bring the numbers more in line with what I was seeing. It’s certainly a place for some potential future improvement.

Final Thoughts

 As with most items I review, I do see some value and some room for improvement with the GSA PRO. The swing path animations were most useful to me and helped me identify a problem I struggle with in real time. This coincided with some greatly improved iron play after a little work.  However, there are still issues I identified that I think would be better addressed through a PGA Professional. The light weight of the device doesn’t interfere with the balance of the golf club, though its location did cause me to think about it during the swing at times. The biggest detraction I saw was questionable accuracy in regards to swing speed and distance, though I do think that can be improved in future updates. The GSA PRO is available for $199.99 on the company’s website,

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Category: Accessories, Equipment, Headlines & News

About the Author ()

Editor and writer Ryan Hawk lives in northwestern Illinois with his fiance and son. He's been a writer for The Hackers Paradise for two years and has been involved with a number of THP events.

Comments (16)

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  1. T2grn18 says:

    Nice job Hawk. Given the complexity of a golf swing, and the amount of physics involved. I think it’s pretty cool to see that wrapped up in a small package for use on the range or course if some chose that option. The distance differential is a problem that I would be interested to see how they can address. Each golf swing being so different, and the way the face angles change with each golfer it seems virtually impossible to come up with a 100 % solution. But its a good training aid to help people play better golf

  2. Freddie kong says:

    Well done Ryan, I like the way this tool sets ups. Some really solid feedback.

  3. DawgDaddy says:

    Great review Ryan, those animations of the swing are very nice looking. I can see where this would be very beneficial if there were some way to know which drills would correct any detected swing flaws. Most probably working with the 3Bays and a swing coach at the same time would bring about some rapid improvement in ones ball striking.

  4. pdgoblue25 says:

    Nice review. I think I would much rather take $200 and go get 5 lessons with my local pro.

  5. Jeremy says:

    Hey great review. Read another good review on the 3Bays Swing Analyzer at and I think Im gonna have to pick it up. Keep reading good things about it. This thing should be great to fine tune some things on the range.

  6. James says:

    I have the unit also and as far as I can tell the follow through arc will not change. I believe the unit stops tracking data after impact. 3bays says it measures all of the swing. Try some different finishes and see what you get. I know the mph stops and the directional arrows stop.

  7. Simon says:

    I am with James here. If you compare your arc with the one recorded in the app that belongs to the pro who owns the company 3bays I believe, your arc always seems much narrower on the through swing. Originally, I thought I was sliding and swaying my hips laterally to the right in the backswing and that could potentially explain the discrepancy in swing arcs. But if you over-exagerate a reverse pivot or try to stay centered on the ball through the backswing in order to achieve a very wide arc in the through swing it is still recorded as super narrow in the app. I think that the gsa must be mis-calibrated. Since a/ swing path is just a relative path between backswing and downswing and carries no meaning, b/ angle of attack is not measured, c/ face angle at impact is not measured, and d/ swing speeds are completely inaccurate, I came to the conclusion that the only meaningful info you could get out of the toy was the width of your swing arc. It turns out I am now in the view that this is also inaccurately measured by the GSA. So in the end, it has very little value and I am surprised by all the raving reviews.

  8. Frank says:

    Hello Ryan,

    Regarding the speed and distance issue, if you add 10g on top of the grip of a club the swingspeed will decrease by approx. two numbers, e.g. an original swingspeed of D2 will be changed into D4. Should the assumption be correct that a higher swingspeed demands more power that might explain your observations.

  9. Frank says:

    Sorry Ryan

    Swingspeed in my comment should read swingweight 🙂

  10. Mark says:

    Thanks for the review, I was considering purchasing this and when I saw it could measure head speed I thought this would be an ideal feature to determine whether this could be a serious tool or just another gimmick. I suspect the discrepancies seen with head speed measurement are due the club shaft being treated as a ‘stiff’ (ie unbending) component of the club. In reality, a well timed swing will generate significant flex in the shaft, which in turn leads to an increase in head speed at impact. If the 3-axis accelerometer is precise enough and also sampled fast enough, it would be possible to calculate shaft flex and improve on the head speed calcs. Admittedly, this is by no means a simple bit of maths, but for me I would expect this to have been done for the price tag. It may still be useful for analysing swing planes, but AFAIC this apparent inattention to detail puts it in the “gimmick” category.

  11. Alan Kelso says:

    As far as the swing speed is concerned, check out the video on youtube where it is compared to a Trackman, a device way beyond the budget of most people. It was remarkably accurate. But even if it wasn’t, let’s say it was always 5% faster than reality, it still allows you to see if one swing is faster than the other, something which is impossible to judge accurately yourself. People seem to think that unless this outperforms the best instruments available for hundreds of times more money then it isn’t worth having.

    As far as carry distance, this is going to vary with the ball that you use.

    I’ve just bought one and so cannot review it yet. I assume it will outlive it’s usefullness in a month or two but hopefully I will have gained some insight into my swing by then.

    Perhaps I’ll use it when I have my next lesson with the pro.

  12. Marcellin Cusson says:

    Not a bad product but after only one year I am not able to recharge the device and the only option is to buy another one because the have no repair option from the companie,

  13. ian matterson says:

    well its been a while since you wrote the gsa pro review, i have just purchased one dec2015, my first impressions are excellent, but i would like to ask if you found as i, that the top of the backswing (i.e pause zone) is repeatedly incorrect, if mine was correct then my driver club head would be level with my knees at the top of my backswing, i have attempted many just over half swings and the result is almost the same i.e the club head finishing level with my knees.
    Any advice or light you could shine on this problem would be gratefully received.
    Seasonal greetings


  14. David says:

    I have bought one of these and I have been very unhappy with it. I have not been able to get it to pair with either my IPhone or my IPad. I have other devices paired with each, so I know it is not my devices. I feel this was a ripoff. I sent an email to the company at the email address they gave but received no response.

  15. Ralph Moorhouse says:

    Used device about a year and could not recharge it!

  16. Sarra says:

    Anyone know if you can open this device up to replace the battery . Battery will not recharge , its 1 year old.

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