http://support.apple.com/kb/TS4384 According to the *#$ recommendation above from Apple. We should not either use palm rest and keyboard cover for Retina display. In fact, without the keyboard cover, our keyboard is fabulous look and amazing touch. But who know when would we spill some Coke or Bud Light onto it. And of course I always want my keyboard new but I'm sweaty, the white letters on keyboard will get darker and dirtier day by day. So, should we or should we not use keyboard cover for our lovely Retina MBP.