I have a Jetbook Lite, and think it is great. It uses regular batteries, has a slot for a memory card, and can read many different formats. It can reflow the text on a PDF so it can be resized without having to scroll all over the place. I also have the Kindle app on my android phone so I can read on that while commuting or in line. I have the use of a Kindle sometimes. It is okay. I suggest getting the free Calibre to manage your books and feed your ebook reader, no matter which one you buy.
I also have a special treat for all of you with an Amazon account. Enjoy!