OK, so my i7 was delivered today, right on schedule. I'm in the process of moving everything over from my old Mac Pro. As far as I can tell, there's no screen yellowing, though I will check again later tonight after dark. No dead pixels. No display whine that I've been able to detect yet.
I did have a minor setback when first setting up the machine, though. Even though I told myself I was going to do a clean install of everything, I decided to use the Migration Assistant. Well, after an apparently successful transfer that took about an hour, the iMac would kernel panic upon boot. Had no choice but to wipe the SSD completely from the install DVD and reinstall the OS from scratch. That, plus the reinstall of iLife, took another 45 minutes to do.
So I guess I should have stuck with my original plan to do a clean install of everything - since that's what I ended up doing by force anyway. At least I was able to save space on the SSD by not installing the extra languages, asian fonts and a gigabyte worth of printer drivers I'll never use.
Anyway, so now I'm still busy transferring my data over - still have a good 45 minutes to go on a long, 600GB iTunes folder transfer. About another 20GB worth of documents and I'll finally be migrated over.
I'm afraid of buying another machine in a few years when it's this one's turn to be replaced. It's taken about 6 hours to copy all my data... I can't imagine how much I'll have in another 3 years!