I primarily use the 770 as an ebook reader, with some duty as a web browser. All the reviews have dealt primarily with the form factor, increased performance, speed, etc. but almost none of them have touched on the screen quality.

Both are high resolution screens, but the 770 had the shimmering "rainbow" effect and a relatively low viewing angle, both of which combined to make it hard on the eyes in dim or dark environments, such as reading an e-book in bed.

Taking a chance that the 800 was improved, I went to CompUSA and bought one, and I can report the following for those who are sensitive to screen quality:

Backlight quality is slightly better, with some bleed and theater-curtain effect on the right hand side but--

The screen is a massive improvement over the 770. Contrast is way up, whites and blacks look very much better, saturation is very much improved.

The grainy rainbow pattern is greatly diminished and almost impossible to detect. Overall, the screen is VERY smooth, free of false color, and the viewing angle has increased substantially, so close-up reading will not result in metamerism or color shifts, with blacks going "gray" etc.

Subjectively, the screen quality went from a 6.5 to a solid 9+. It is an awesome, beautiful screen.