After comparing and researching, we decided on the nook. My DH and I each have one, and our daughter got one for Christmas. She is able to sign on to our B&N account and read any of the books we have downloaded. We can all read the same book at the same time if we desire. We can buy from different sources and also have priviledges at three libraries. The nook is readable in bright sunlight. The battery is changeable at a cost of about $25, far less than the cost of sending the Kindle in to Amazon and paying for a new battery, about $80 from what I have read. The B&N E-reader program is available for free download to a variety of devices and more are being added. If you switch between devices, the book opens to the last page read.