Used the 17 for the first time last night -- can't say I was a huge fan.
The biggest strength was huge, bouncing up near and around my opponent's head. I never got comfortable with my groundstrokes, although by the end of the session I was dialing in my backhand. Had to scale in my forehand to keep it within the lines. Volley touch was nothing to write home about, and I had some trouble controlling my flat serve.