My Sony 650 seems to have very good contrast in very good light, the background - as you note - very close to as good as many paper books. The real difference, that I definitely notice, is that the contrast is rapidly lost when the light is not so good - even by relatively small amounts. The black is not so black and the "white" now a much darker gray. As someone switching back and forth between paper books and Sony reader this is a difference that I find very noticeable and it puts the reader at a distinct disadvantage to my no longer perfect eyes.
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