A few people in my family have them and love them - they have Kindles. My parents have one each so when they go 4WD'ing they can both sit up and read. Theirs are linked together so they only need to download a book once and can share it (same as if they bought a real copy). My sister has a little light as part of her cover on her Kindle so she can read it in the dark.

I think they sound awesome, it will probably be on my Christmas list, but maybe next year.