The 24" does appear very grainy compared to the others in the range, it's definitely the weakest of the bunch.
We have the 20", 24" and 30" panels at work, the 20's are very nice to work on, we have about 40 of them in the studio and not a single one of them's suffered from stuck/dead pixels or backlight bleed. We have them calibrated with Colorvision spyder's, correct colour profiles etc and retouch imagery for print, mainly national press and magazine work, admittedly they're not Eizo quality and don't have all the bells and whistles that the Dell does, however, they're connected to Quad G5's using OSX Tiger and tend to be used purely as workstations so the extra connections aren't really used for anything anyway.
Compared to the nightmare I have had with my NEC 20WGX2, (one DOA, one with backlight bleed, trying to get the image quality right in XP etc), the apples been an absolute dream to setup and use, (which could be a lot to do with the OS) admittedly I've not tried gaming on it though.