I bought the LG 27UK600-W, and I have 14 days to return it. I'm probably going to do that, because the vertical color temperature shift is very annoying. I had a TN monitor that exhibited the same problem; now I realize that I had incorrectly assumed this was a problem unique to TN! And I set my monitors to 5500k, which exaggerates the problem (I have dry eyes; warm temp helps my pain). Edit: bigger problem with this monitor - I can't get it above 1.3 gamma... It's incredible! Is there another semi-gloss, 4k 27-28" IPS monitor that I might like more?