i think a lot of us who buy e-ink readers do so because we get eyestrain easily. that is certainly true in my case. i have an eee pc but can't read on it for extended periods any more than i could read on my computer - i get very bad eyestrain. so for me, having my cybook not lit is the reason i can use it.
you can, btw, get a very small clip-on light for your ebook reader if you need light. i believe some even have their own batteries.
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