I've only had my PRS-650 for a few hours, but I already like it a whole lot more than the PRS-600.
- No More Glare

- The background is whiter and the text is darker.
- It starts up from shutoff a lot faster even with 480 books.
- I like having a screen saver for sleep mode. Now I can tell the difference from being shut down.
- I can finally edit Collections on the reader.
- I like that it supports full justification.
- Now I can sort my book list by when I last read it. One of the features of the Kindle that I liked.
- I like that it finally supports cropping of the PDF margins. It could do a better job of it, but it isn't bad.
- Photos look better.
- The reader is lighter.
It still does not support soft-hyphens. It will break on the soft-hyphen, but it does not draw the "-" when it does break.
It also no longer has page numbers in the right hand margin. I did not care for them, but that should have been left as an option for the user. I'm sure there are students that would need that for class.
Sorry the quality of the photos is not better. It isn't a great camera and I didn't feel like bringing in more lights.
Etienne66