I have noticed its more noticeable on the ACD than others, but its not much. You do quickly get use to it thats if you're not sitting too close? Strangely though I have found the default Tiger walls seem to show it up more than any other wall or its just an illusion to me...
Other TFT's I have you hardly notice this unless you really focus on it and I mean really look up close. I do find the clarity on the Apple displays much better for design. Plus best of all the alumunium is not distracting like most monitors that have a black surround, which always seem to draw your eyes at times as where the silver is it seems to dim down in lighting enviroments and you focus on your work.