Mine's better than perfect
I got my maxed 27" on Saturday Dec 15. Originally scheduled for Dec 24-31. I'm coming from an early 2009 24" iMac and I have to say that the 27" screen is the best I've ever seen. The glare and reflections are almost non-existent, way better than the old matte screens, in my opinion. The 3TB Fusion drive is also amazing. Final Cut Pro seems to do background renders nearly instantaneously. Illustrator, InDesign, Photoshop, all just open when you click their icons, no bouncing off the dock for what now seems like minutes on the old 09 iMac. I don't do games, but the 680MX with 2GB makes Photoshop (and Final Cut) just work. And I don't know how it's possible, but sitting square in front of this new iMac, I can still tell it's only 5mm on the edges. Actually it seems like it's just a piece of glass floating off the desk (okay, with an aluminum chin). It's been running since I got it around 1pm on Sat and the back is still cool to the touch, everywhere. I can't find any warm spots anywhere. Amazing.
So yeah, I'm pretty happy.