Actually in my case I have owned the Sony 505 for almost 18 months. For the first 17 months I didn't need the folder support. My library has now grown to the stage (1500 books) where I would like two levels of hierarchy and I was trying to figure out how to get it. It looks like PRS+ is my only choice if I stay with my Sony. I could give my 505 to someone in my family and buy a new ereader. Just checking into my choices if I do that. I now know that it is "folder" support that I need to look for if I want two levels (series within collections for example)...........Jackie
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