Perhaps the most interesting part of the game lies in multiplayer: though we didn't see it in action, we were told that the game offers up to four-player WiFi multiplayer (even before 3.0 is set to make it easier for developers to do). So that's pretty impressive in and of itself -- if you can find three other people with iPhones and the game to play.
Finally, Gameloft explained to us that they didn't bother getting rights to any of the players' likenesses in the game, but they still wanted it to be as realistic as possible. So instead of Roger Federer, we found ourselves playing as someone named "Tanerer." We didn't recognize who Dubbs or Voldun might be representations of, but it's a guessing game for tennis affcionados as you try to figure out who's who.
Real Tennis 2009 is definitely a solid tennis game -- if you're not ready to be quick on your virtual feet, or are looking for something more casual, you might check elsewhere. But with eight players, seven courts and three surfaces (not to mention some interesting multiplayer options to try), it's a worthwhile tennis experience.