If you are interested in viewing pdfs in a small e-reader device, take a look at the Onyx Boox forum: I have an Onyx Boox i62HD, and the online store "ereader store" provides a firmware very intended to read pdfs. I read a lot of scientific papers and I'm happy with it. It has a "paper mode" wich makes easier reading two (or more) columns documments with less panning.
They reader comes with case and charger.
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