Having previously owned a Kindle, I was not expecting that e-book readers had much improved over the last year. Contrast on the display was a big problem for me, and I wasn't especially keen that the Kindle uses a proprietary book format that cannot be read on other e-readers. So, as long as I stuck buying books from Amazon for a Kindle, I was fine; the second I ever wanted to move to another device, I couldn't take my books. This didn't sit well with me.