I think the days of rampant iMac troubles are behind us at long last. I remember the Apple discussion boards being absolutely flooded with issues, as well as this forum. Now it's much more rare. I'm confident in buying a much-awaited i7 BTO in a few weeks.
Just picked up the 27" iMac 2.8GHz i5. The screen is flawless and the enclosure is cool and quiet. I was able to squeeze in some time for Starcraft 2 and CS:Source, both run at the native resolution and "High" settings and seem to be buttery smooth.
The only negative thing I have to say is the magic mouse is not ideal for gaming. One reason being I just want to be gentle with it, but more importantly I sometimes unintentionally scroll. Which is not a problem with day to day use, but fatal in CS:Source (scroll == change weapon).
Purchased the 27" 2.8 ghz i5 two days ago. Installed all my software, adobe creative suite, aperture, a few architectural rendering programs and a couple CAD packages. Everything is brilliant! My only scare was as I turned the imac on for the first time there seemed to be some moisture on the inside of the screen and the only way I could get rid of it was to rub violently over the area. It soon disappeared.. I guess it will have been caught there during the manufacturing stage, a little worrying! I look forward to installing windows (Traitor through desperation of specific CAD programs) with bootcamp to find out the performance across the board.
I'm totally thrilled with my 2-month old 2009 27" i7.
If I had to pick something to complain about, it's that 1TB SSD drives aren't cost-effective yet. In a quiet room with such an elegant machine in front of me, even the quiet, dull grumble of the HDD is a tiny bit irritating.
I love my new i5 I picked up today at the Apple store. It has very minimal yellow tint towards the bottom, and the only thing I'm finding annoying about it is the hard drive is noisy because it's a damned Seagate. Other than that, well worth the money.
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Just got my 27 in I7 (free shipping and it came next day!). All seems perfect but on an all black screen, I see some light leakage from the left side. More of a nitpick since my screen is almost never entirely black but that's my only minor complaint. Otherwise, nice step up from my 2006 MBP Core Duo.
Im a pro-photographer, using both the Imac-27 and Eizo monitors. If you get a good 27, believe me, its a joy to work with. fast!!! elegant, simply an outstanding piece oif machinery, BUT! you got to get a good sample.
On my second one, bought originally 1.5 mos ago, got replacement 1 mo. ago. One dead pixel, very soft whine (not audible to my ears below brightness 14), light yellowing near the bottom, I see the gray band sometimes on full-white screens.
It's far from perfect, I wish Apple's QC was better, and I could have certainly had better timing, but what the hell, I actually love the thing anyway. I think their current level of quality is certainly challenging to the perfectionist, but the overall product remains sublime.