I had the infamous yellowing issue with my previous MacBook Pro. My new one (a 9C84) definitely doesn't have it, but I can tell that the bottom third or so is a touch lighter than the rest of the screen. It's not easy to see, but if I use a gradient background or watch as I move my windows around, I can notice it. It doesn't bother me, but it is curious: is this just a symptom of LED displays?