I love mine. I have the first version the 500. I would only change two things: first I would like it to be backlit, and second, I wish it would actually read .pdf. It claims to but the type is much too small for the average person to read, so I have to do the old "convert to text" that I use for my ebookwise 1150.
The battery lasts a long time and it holds tons of books without adding memory!!!!