I have both, the original Nook, and the Kindle3, as well as the Sony 300. I find that I alternate between all 3. I use the sony for library books, for some reason loading them to this ereader is so much easier, at least for me anyway. I flip between the Nook and the Kindle. It depends on the prices of the books, if one is cheaper. If I am traveling, I take the kindle, since the battery lasts so much longer. The nook does not hold a charge long enough for long trips. I'm a gadget person, so I use all 3 of my devices.