I have a PC and I bought the DELL monitor thinking it was an Apple display + DVI port. Wrong. The DELL U2711 and U3011 have a VERY aggressive antiglare coating that makes the whole panel "sparkle".
I immediately returned it and bought an Apple LED Cinema Display 27" + Atlona AT-DP400 DVI to mDP converter. The ACD27" has a much more vivid and vibrant image than the DELL. The Atlona adapter is a little bit pricey but imho its worth it considering the quality of the display!