That being said, I have been playing Full Ace Tennis for more than a week now and I am still getting used to the physics and interface of the game. From what I heard from other players, Full Ace Tennis is probably one of the hardest tennis video games to master. I would definitely say that this is up there with games such as Halo Reach and Counter-Strike: Global Offensive. From what I hear, the game pretty much sucks you in, like you have never played tennis before in your life before.
You can unlock every single career mode, which is fun and very rewarding, like if you were an incredible tennis player, you could unlock a career mode that allows you to be like tennis legends like Andre Agassi, John Mcanroe, Martina Navratilova, Kim Clijsters, Andy Murray, and Serena Williams. The Career mode allows you to start off as a recreational player and then progress through each level of the game, earning money and advancing through tennis leagues. Along the way, you'll learn the ins and outs of the game and maybe even change some things about yourself, like losing weight or gaining some. Which I think is pretty cool, because there aren't many sports games where you can custom make your own character. It's really fun and makes you feel like you really are playing a professional tennis game.
Another thing I love about Full Ace Tennis is its popularity, it has the most number of people playing it on Xbox Live Arcade than any other tennis games. The game also has great sound effects and the online community is pretty tight, so if you ever play against someone, you can be sure they will beat you. I haven't yet been able to find any bugs in the game yet, but I will keep looking. Overall, Full Ace Tennis is my favorite tennis game, and the full version is definitely worth the price.