I have one and I LOVE IT. I was resistant when my husband wanted to buy me one because I didn't think reading would be as enjoyable without the feel of the book and turning the pages, etc. Since owning one I have realized it is an even more pleasant experience. When reading those big heavy novels (pillars of the earth, HP, etc) your wrists start to get tired but the kindle is SO light-weight it is very nice. As for books being expensive: yes, some are. That is why I don't exclusively use my Kindle. The library still exists :) Amazon has also just enabled sharing with other kindle owners. My mom has a Kindle, too, so we share the books we buy.
The only thing I would change is that i never know how far through the book I am. It gives you "location" numbers, but those numbers mean nothing to me. I would rather see a page number.
at 11:21 AM on Jan. 29, 2011