Hello, I noticed both operating systems are buggy, and these are some of the issues I have noticed and so have Apple Senior Applecare Techs. 1) 10.7 (Lion) only recognizes 384mb of video memory on the HD 4000, when it really has over 500mb. 2) 10.8 (Mountain Lion) has a sleep/wake issue in which if the MacBook Pro is lid open, then told to go to sleep, it will go to sleep. (as it should). Next, close the lid and after a second the MacBook Pro will wake up, then go back to sleep. This is a CONFIRMED software bug, not a hardware issue. What bugs have you noticed?