Just picked up Top Spin 3 the other day after playing VT3 and TP3 demos extensively. ^ the last poster couldn't be more correct. This is a great sim. After a couple frustrating sets and quiting early after getting my a$$ drug around the court, I practiced, got better, then took on some real competition (Nadal vs Federer). The visuals are amazing in themselves. I'm no g-blade, but I was in awe at the details of the players sweating and having their clothing get more dirtier as the match went on. It was a far more challenging and rewarding game experience then what the VT3 of demo offered.
It is so much better than VT3 imo. It is far more realistic.. I have the game and have the demo of VT3 and after playing TS3 for a while then going back to VT3, it made me realise just how much VT3' gameplay is NOT like real tennis.