I have one, and love it. Was worried about it, as I also love the feel and smell of paper books. I said to myself I'll read fiction ont he Kindle, and non-fiction on paper, so I get the best of both (and it makes my bookshelf look high-brow!). I love it to bits now though, and find paper books really inconvenient. Having to hold it open to see the text, turning pages... seems so archaic now! I found the last paper book I read a right pain in the arse.
The only problem I have is I love the look of a bookcase, but I've gone completely digital with my music, and think it's going that way with my books now.