i have the 1.8 GHz 64gb SSD and my biggest concern is will i be able to tell a difference? all i know is that i'm fed up with the constant overheating with the rev a's and i was wondering if they fixed the problem by switching over to 9400M's. Would you guys if you were in my situation buy the new macbook air or a 3.06 ghz, 128gb SSD macbook pro?