HORRIBLE CONFESSION TIME: mine is a Kindle :P It wasn't my choice (gift horse and all that), but still, I know. I haven't bought e-books from Amazon and don't really plan to, but I hate that something I actually really like as a physical device (it's very comfortable to hold and easy to navigate and all that) is tied to it. Thank goodness for Calibre and the ability to easily convert files from and to mobi. Also, it doesn't have a ~secret internal memory~, which I'm now incredibly grateful for. I've had files from Netgalley sent to it directly, and when this messes up the formatting (which from what I hear happens 9 times out of 10 - seriously, wtf :S), it's easy enough to access and reconvert them with Calibre.