I bought mine at a local Apple store and when I got home after about an hour of setting up and use I noticed that some webpages had this slight dirtiness to the left mid to bottom tint. I'm debating going back to the Apple store for a genius bar visit but I'm afraid they will snuff it off as fine. It's not quit as yellow after leaving the montior on all night but it's 100% dimmer, and it sticks out now like a sore thumb. Here is an image of it with a 50% grey and the post I made on Apple Discussions forums, you can see the discoloration on the left starting from midway and going down to the bottom of the display. When I was writing this post the bottom of the browser almost looks like Apple put a Horizontal gradient from left to right across the background of the site. So **** annoying... I will probably just return it the only issue is I paid cash (10 day wait), though I wonder if they'd let me get a gift card so I an just order from the online store (less hassle with dealing with people in person incase there is same issue with screen on a new one). I'm very aware early adopting is like playing the lottery and there is going to be slight defects but still very annoying.