I upgraded recently from a 2nd gen paperwhite to a kobo aura one. I have been super happy with the aura one. For me, the deciding factor was the fact that I read a lot of tech books from packtpub, and the screen on the paperwhite just wasn't large enough for reading code snippets comfortably. I've been super happy with it, though. I did discover that if I turn the natural-lighting up too high I do get some odd color artifacts, but that hasn't really bugged me much because I usually keep the natural-light pretty low anyways.
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