Many of the Kindle Ones had bad batteries which would self-discharge; Amazon would replace them for free. I had this problem (charge would only last a day or so), but I broke my K1 before getting it back to Amazon for repair (while durable, putting it in a bag with an inmarsat bgan terminal, then having 1000 pounds of other bags on top of the bag, leads to screen cracking...)

I actually preferred the shape of the K1, and the buttons being on the left as well.