Summary: I bought this item today, I spend 4 hours to calibrate my monitor's colors. But the white color is yellowish even in 7900K!. When I cool down to 9600K, yellowness mixes with the cool blue and white seems greenish. I called the dell support, they claimed that this is not a technical issue!
Summary: I bought two U2412M monitors about a month ago. I was so excited to extend my MB Pro display. I wasn't to believe that these monitors would match the display of Retina. I connect these montiors through Thunderbolt port and DVI.
Summary: My new U2412M had 3 dead pixels, so I call Dell support and they send me a refurbished U2412M with a burnt out left side. After emailing pics, Dell support sent me a brand new U2412M and it has 1 dead pixel. After the hassle of returning 2 U2412M monitors and getting a third with a dead pixel, I can't rate this monitor more than 1 star.