The keyboard is a huge negative for me. Why would I want a significant chunk of my screen space taken up by a keyboard on a device that I'm aiming to use primarily for reading?
I've got a Kindle Keyboard, and it's nice because I can input words at reasonable speed and don't need to touch the screen and get it fingerprinty. Kindles with the five-way button were a pain to input words into, but the page turn buttons were nice.