I have a 15" Powerbook, and the screen is grainy. Also a 17" C2D which I just got, and the screen is perfect -- no grain whatsoever. One thing I notice is that the viewing angle on these screens is not as wide as one would like -- when you're right in front of the 17" screen, the corners are a bit dim because of the viewing angle. This happens on the 15" also, but it's less noticeable. In thinking this over, it seems to me that this has to do with the nature of portable screens, which cannot draw as much power as a screen you plug in. In order to maximize the brightness, the angle of vision is narrower in these screens. Given that, I am quite happy with my 17" -- it's quite bright, and one gets used to the restricted viewing angle.