I have a 2 day old iMac 27" that I waited for 4 weeks for because I custom configured it. I discovered in the upper right corner near the apple logo of the screen its slightly dimmer then the rest of the display. Not sure if this is typical or not. Machine otherwise is fine, no dead pixels, geek bench score of 14433 and dont know if I should exchange or not. almost 3k is a lot of $.