I had many different displays, Samsung and LG. Actually, Samsung and LG both get their screen under different manufactures who work for them. It is not always about LG.. as we see from the survey, there are many people who tested IR and nothing happened. I had 2 Samsung screens and returned because of uneven brightness and dead pixels. While on return/exchange process, I saw two different things from these variation: LG and Samsung do have perfect (free of defect) screen and imperfect (very uneven brightness, yellow tint gradually, active and dead pixel). IMO, I can agree people who really want to get Samsung screen because they want it so badly (with a generalized thought Samsung is 100% defect free). But really, I see LG one is as good as Samsung and both are GOOD. I chose LG screen (defect free) and white/black was JUST so amazing comparing to Samsung and other monitors I have. First time I bought rMBP was last july and finally chose one this early month because they met my highest expectation- perhaps I guess they really improved quality control but it is just my personal opinion. But I do believe you will get less placebo effect if you really have a chance to compare them. I am picky as anyone accused of having OCD and the quality I see now on LG screen does meet my expectation.