I have had one for 2 years now and has never given me anything other than pure pleasure. I got one for the ball and chain too and she loves hers. I read everynight in bed and this has saved me so much in space. I have 60 odd e-books on my Kindle. I don't have space to store 60 real books in the house. Only down side is waiting for all my favourite authors to become available on the Kndle format.
Thinking of getting a touchscreen Kobo with some WHS vouchers that I got for Xmas. I think they're the second most popular E-reader after the Kindle. Not sure how they compare though.