I am using a cover for my MacBook Air, and it opens up like a book. It also has some suede material for palm-rests, and when I close the cover, the lid closes on the suede palm-rests (and then you can carry the MBA around in the cover). I heard Apple issued a warning about using a palm rest for the MBP, saying that it might leave a gap between the lid and the palm rest area, altering the hinge mechanism permanently so that the MBP doesn't close completely. My question is, for the MBA, do you think it would be safe for me to continue using the cover I have (and closing the lid on the palm rests), or should I get a different cover? Has anyone had this kind of an issue because of using a palm rest with the MacBook Air for long periods of time?