My only experience with Dell displays has been with stand-alone LCDs. The two I have, plus the one I put at my parents house were certainly bargain priced, but their quality sucks compared to the screen in my PowerBook and a 20" BenQ I have here.

The image changes considerably with viewing height and color temperature is not even through-out the screen of each display, but I can't say it ever seems that text is out of focus.