I'm a current 9650 user and quite happy with it. It's just that I've always loved the flip phone form factor. I had a Pearl Flip 8200 on AT&T only to be terribly disappointed with everything about it. Too small (especially the postage stamp-sized screen), awful implementation of SureType, laggy OS, and dreadful build quality. The Style corrects all those things.
The only reason I didn't pull the trigger is price. It would be $325 to me to buy one new with my partial discount. I get another $75 off come next May, but that's a full year away. I will have had several new BlackBerrys by then!
I was told by a Sprint rep that battery life is a bit worse than the 9650, primarily because of the faster processor. Current users, how do you find battery life on the Style out in the real world? If it's not any worse than the battery life on my current device I may pick one up used.