Shotwatch is an interesting idea. You wear it on your wrist and when you hit a great shot, you hit a button to tell it to remember. Then, as you make other swings, it uses feedback to tell you when you deviate from the ideal.
The thing I wonder, though is how useful it would be. I already know when I’ve deviated from the ideal shot. The ball flight tells me that. So the watch must do something else that doesn’t come through in the site advertising.