it seems like the OS X driver for the Radeon 6750M is very buggy. After a clean install of OS X, I have severe crashing problems in many 3D games. Half Life 2 / Left 4 Dead games will hard lock the system randomly during gameplay. Trine hard locks the system during gameplay (fullscreen and windowed) Pretty much any fullscreen game app crashes the OS on exit--the mouse cursor is still moveable, but the game doesn't exit fully and no key combination will make the OS react. If this thing didn't perform so beautifully in Windows 7 boot camp, I would suspect the hardware was faulty. As is, it seems like the ATI driver for OS X is piss-poor. Is anyone experiencing issues like this?