I just downloaded this bad boy this afternoon after I got the email from macgamestore. What an amazing game! Its visually stunning and plays so smoothly with all settings set to maximum on my MacPro*.
I initially played a bit with the keyboard but then plugged in my old Logitech Dual Action gamepad but the left analog stick kept drifting off to the left, annoyingly. To my amazement, a PS3 SIXAXIS controller I borrowed off of my little brother works even better and is recognized via Bluetooth and direct USB! I would HIGHLY suggest using a gamepad for this game if you have one, its a very noticeable difference in experience. Heck... I'd probably purchase a steering wheel just for this game! ...if my wife let me...! lol
The race types are amazing, the visuals are stunning, the physics are the best I've experienced in quite awhile... and its fluid... the gameplay is so fluid!
If you can run this game and you like the reviews I've no problem suggesting this game... my mouth was dropped open for the first few minutes just looking at this game!
My system specs; MacPro 2009/Single Quad-Core Xeon W3520 2.66GHz/Mac OS X 10.7.1/4GB RAM/Radeon HD 5870