I have both and I don't have an answer yet. I've mostly been using K2 for comparison with K1 and new feature tests. I've just started reading a book on K2 (one I started on K1). I think K2 will become my primary reader. K1 will fall out of warranty next month. At that time I will take it off the Whispernet grid (not sure if I'll just keep Whispernet turned off or deregister it). It will be used to experiment and test some the new software extensions people are coming up with (most right here at MR).
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