I've already sunk so many hours into this game and absolutely love it. I'm a huge tennis fan and this is definitely the best representation of tennis I've ever seen in a video game. Put the camera in "Close Wide" and enjoy the stunning visuals! The roster is fantastic, no other tennis game comes close and many of the players have their own unique animations and grunts. Each player has a different serving rhythm, which can be difficult to get used to but very satisfying when you master it.
The gameplay isn't perfect, there are still some shots missing that I'd like to see. Players sometimes struggle to lock onto high lobs to smash them, and I'd like to see some kind of lob recovery shot, like a tweener.
There have been a few problems with AI but the developers have released several patches and it's a much more challenging experience now.
Online is where the game really shines, I've yet to delve into the career mode, so can't comment on that. Do I think the game is worth the money? Absolutely, go ahead and buy it!