So I'm now on my third Macbook 12" unit, and definitely loving them. However I've had repeated issues with sticky keys, in particular the space bar getting stuck and unreliable at the edges. I asked an Apple Genius for a full refund and they were reluctant. Instead he very strongly urged me to take a unit replacement and see how I find the keyboard. Well. With this new unit the keyboard feels *very* different. The keys are quieter, the travel feels further, and there is no hint of stickiness. I believe that Apple updated the "butterfly" keyboard on the recently released MBP, and I wonder if they've quietly upgraded the Macbook 12" with it too. Anyone else feel a difference in recent Macbooks?