The screw in sensors are my favorite too but most because the grips with the sensors wear down too fast. I have become completely comfortable with my phone in my front pocket after years of needing it there.I think once the link is released with the issues hammered out, Arccos will have the killer product. Especially if there is a button to mark the hole location on the device.
Arccos has great stats but unless you move the pin they kinda get inaccurate as you get closer to the hole. I know this is a minor issue and a lot of people are quick to adjust pin locations, but it is something that I wish was easier to do.
After swinging with the screw-in sensors for awhile over the built-in grips I think I prefer the screw-in grips. I usually grip at the end of the grip and the built-in ones have a lot of play to them to support the sensor. The screw in ones it's obvious if I'm on the sensor and can choke up a little bit.
Phone in my pocket is okay. You get used to it, but I would prefer to not have it in my pocket.