OK, this is weird. I finally got my rMBP and....as everyone has been complaining about Mission Control is stuttery when its activated and kind of annoying. Well, it doesn't really bother me, so I don't care, since everything else is so good. I rearranged my desk and got my second display plugged in and guess what. All of a sudden...no stutter at all...everything is perfectly smooth! I did notice that discrete graphics are required in order to push multiple displays. Is this the reason? I tried switching to discrete without the other display plugged in and it was still stuttery. It only seems to clear up and run smooth when I have to power a second display!! How weird! Good to know it is just a software hiccup and not at all to do with the hardware! I'm sure it will be cleared up soon.