It appears to me that most people who swap their iMacs in the same Apple Store they got it from end up getting the same problems. Well this could mean the entire store could have gotten a batch of bad units. So it probably does not matter much if you exchanged 4-8 times in the same store, you would probably end up with a unit in the same batch... So far most of the "finally no more yellow" posts I have read are i7s, which are exclusive online. And most of us who order the i5s (myself included) probably gotten them in the store. Which leads me to believe that there's something else that Apple might be doing over online orders. I think that you would have a better chance to receive a good iMac if you had ordered online vs getting a swap in the stores. Of course this is nothing but speculation. But it's what I am planning to do within the next weeks, probably after Apple's event.