I have had Smash Court Tennis 2 and Virtua Tennis 3 and was waiting for Vitrtua Tennis 4 and decided to see what Top Spin 3 was like.
Having played Virtua tennis it is a little difficult to change between the two games, mainly because on Virtua tennis it is impossible to hit the net and it is impossible to hit the ball out, no matter how badly you time the shot the ball will go in.
On Top Spin 3 however, if you miss time the shot, you will either not get it quite where you want it or hit it out or at the net, if you go for a high risk shot and miss time it, you will not get it in. It is hard to pick up on but with determination time and patience you will be a match winner and it is great, seeing the red exhausted faces, the dirt on your shorts, and the sweat down your front and back at the end of the games, or even in the middle. It even goes into as much detail as when you are playing on clay and can't quite get there, you can slide accross the clay in a last gasp effort to get the ball.
One last thing to mention would be to all those people who have an Xbox and are looking to get this game. If you are wanting Rafa Nadal forget it, he only appears in the PS3 version, it serves you right for purchasing an xbox really.