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Sony has one which seems really nice (based on the 2 minutes I played with it once): https://pro.sony.com/bbsc/ssr/product-DPTS1/

Unfortunately it is a bit limited (only supports PDF's out of the box) in what it can do and much too expensive.

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It is the best electronic device I have owned in years. Has a well defined feature set and hits that feature set spot on. Unlike most other devices, it does not try to lock you into any kind of ecosystem. Setup a webdav server, throw your pdfs on it and this device will automatically sync and pick up new pdfs you add to your server. Plus you can use a memory card.

I would've killed for this in grad school. At the time (well still, with the exclusion of this device), there weren't any eReaders with good PDF support, especially for technical documents with nontrivial typesetting.

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