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1- Solar charging - not helpful if you seldom read outdoors or in very bright light.
2- WiFi - great in the certain areas, worthless on others. And I want the book in Calibre to handle the cover, metadata, and series/collection information.
3- Books stored online, not helpful for those of use you travel in internationally and do not have access to wifi much of the time (I can put my entire Calibre library on my laptop though).
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