[This review was collected as part of a promotion.] I bought one of these at the apple store in The Hague. The color uniformity was atrocious. The left side of the screen had a reddish tint to it, and the right side looked more greenish. This was especially obvious on white screen content such as an empty safari window. I returned the device the next day and was given a choice of refund or to try another one. I opted to try another one. This one turned out to have the same problem, only slightly less. Returned it and took the refund.
[This review was collected as part of a promotion.] Not being able to make up my mind I have purchased BOTH the 21 and 27 LG displays for my new MBP (knowing I can return the one I decide against). The 21" fired right up..very fast. excellent color...highly responsive. Seems to work just like its advertised! I then tried the 27" - faster thunderbolt, internal camera.. Big mistake. It flickers, the MBP can't seem to find it, secondary tasks seem to take a long time. Very disappointed in its performance. Seems the video requirements of the 27" might be pushing the MBP to extremes. Initially I thought out of the box I'd be keeping the 27". Not so. I'm returning the 27" because of these issues. I wish the 21" had the internal camera for obvious reasons, but the 21" is a hands down winner for me.