That's pretty great, didn't know Nadal was using it. The Babolat Play racquets are still a little bit too expensive (300 Euros here for a Pure Drive, and it was 400 until recently), but in a few years, I bet a majority of the models will have some kind of tracking tech implemented. It's really fun to have stats on your game.
I recently tried
this device from Artengo, which has the particularity to adapt to any racquet. Some stats can be useful to adjust a few things. Unfortunately, the device is a little bit too heavy. The Babolat Play models have the same weight as standard models, so that's better in my book.
The two problems I see are, at least for the time being, that stats are not that detailed (you can't have things like shot placement, 1st serve percentage, successful net approaches, hell, even errors, which are all too difficult to accurately track) and you don't have a way to know how accurate the stats you have really are.
Serena next, ouch.
