Long battery life, good prices, good hacking scene, rather impressive support for legacy devices, etc.
A lot. Oh and a screen that puts no strain on your eyes. My first one was a Paperwhite 2 (still have it but it needs a new screen and frame), and then I got a K4, then K1, and now a KT1. They're great devices and frankly there are so few companies that can match their quality and support.
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