When I first got my K2, my main complain was that the screen wasn't larger and no native PDF support. KDX solves both those issues.
That being said, though, I've come to love my K2 so much that I do worry about the portability of the KDX. Lately I've been mostly reading while on the treadmill, and I think the KDX might be too unwieldy for that. I'm also annoying they removed the buttons on the left side; this means I can't just switch hands every few minutes when the other one gets tired.
So I may wind up using the KDX only to read PDFs at home. We'll see.
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