21.5 is a nice IPS display, a huge upgrade over the 20" iMac (which had a TN display and was in short horrible). 21.5 is a nicely done machine, the display is now on par with 24 & 27 iMacs.
I don't know how real this is or not, but I may have some yellow tinge on the bottom half of my screen. Or it could all be psychosomatic with all the talk of yellow tinge. I'm not a professional photo or video guy, so it's not that important to me. Like you've said before, if I hadn't read these forums, I would never have known of the issue.
I figure if the problem get worse over time, Applecare will provide me with a new one till I'm satisfied.