I've been to many -- I don't know what to say but video and Porzak Golf - spend $500
Avoid
They do not explain the steps in their instruction - they need to give an overview.
They try to make you look like a pro right off the bat
They don't take video
They have no swing monitor ie something like Trackman
They say "swing left" but do not explain how and what that means.
They don't explain swing path.
They don't tell you that your body may be too stiff for certain moves (they don't suggest flexibility exercises or a book)
They do not explain in detail the grip, posture, feet, ball position.
They do not explain backswing and various movements, and then downswing and its movements, or they try to do too much at once.
They do not look at your clubs and see if they fit.
They say "P1", "P6" etc. right off the bat.
They don't ask you what you want out of the game.
Oh, there is a whole lot more...
Having taken lessons from both Adam Porzak and Mike Pitt, I would disagree whole-heartedly. They're very expensive and certainly not for everyone, but I have personal experience that contradicts nearly every point. That said, not everyone likes the same thing so I certainly wouldn't keep spending that kind of money with them if they're not what you want.