I've heard the horror stories of more than 3+ exchanges due to the yellow band issue. I know this issue and will be bothered by it because I've been through it with the 15" Santa Rosa macbook pro (exchanged it 12 times at 2 different apple store). So far I've sold my 2.26GHz Mac Pro + my 17" uMBP and currently bought the 13" uMBP. I was looking at exchanging my 13" for a 15" uMBP (matte) but now considering other options. I already own a 24" LED ACD so I might either sell that if I do go for the 27" iMac OR use it in dual screen with it. My main reason to go with an iMac is that out of all the hardware Apple is currently offering, I'd feel so much better buying the i7 that the iMac is offering especially moving up to a much bigger screen. Oh and LED backlighting helps as well. But what do you guys think? My other question is, how hard is it to upgrade the HDD in the 27" iMac??