I ve bought the MBA 11 ultimate. My brother did too. Both arrived on the same day, but mine cant stand still on a desk. Take a look at the video: http://www.youtube.com/watch?v=RrOrCTsgMPQ Two possibilities: My 4 MBA small "rubbers" are unaligned (I cant realise this through naked eye or even with a ruler), creating 2 different planes, or the chassis is curved, which seems kinda odd too me. I decided not to return the mba, sicne in Brazil it would take some weeks to get an MBA ultimate replacement, but now it seems the problem is getting worse (loosing more alignement or the chassis getting even more curved (!?)). What is your guess? Did anyone get around this?