I can't say I've ever had quality problems with the screens on any of the Mac laptops I've used. Admittedly I'm not a graphic designer (and I'm mildly colorblind) so I may not be able to recognize that I'm not seeing all the colors I'm "supposed" to be able to, but viewing angle, contrast, etc. have all been fine. Only thing I've ever seen is the backlight in an older (3+ years of constants use) machine starting to go.