My 600 has now arrived and I've had 24 hours to use it. I've been using it in the same way as the 505, even to the point of loading the same books on both and continuing with one that I was half way through.
The screen on the 600 is definitely more reflective but for me that doesn't detract and I like the additional features. I've been reading in bed with a lamp above my head, under fluorescent lights in the office and by a window with natural light. I was reading happily in all these situations. It did make a difference when I moved the book right next to the bedside light, but I never usually read like that, I just tried it for a comparison.
So far I like the 600, and think I'll be keeping it and getting rid of the 505, but I'll wait a bit longer before making a final decision.
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