Engadget argues that E Ink tablets suit reading and writing better than an iPad, thanks to reflective eye-friendly displays, paper-like matte screens and far longer battery life. Color performance, response speed and hardware limits mean they still cannot fully replace Apple's tablet for video and rich web content.

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That focus gives you unique features you won't find in a tablet or laptop trying to be a jack-of-all-trades. Things like an E Ink display that causes less eye-strain and looks more like paper. Or a textured glass screen that feels rough like a printed page. Or extra-long battery life because of the different performance demands.