As a matter of record, my Sony PRS-700 does exhibit issues of ghosting from time to time. I've only had it a week now, but after a charge session there is a slight ghosting of the charging screen - but this goes away after I turn the reader on (i.e. refresh to the home screen.)
It's a little disconcerting at first, but as others have said, these type of screens don't burn-in, so it's not really anything to worry about.
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