I need a single book and news reading device which I can take anywhere. Being a text-oriented person, my K3 fully meets the need.
I do generally carry an employer-supplied, locked down, cell phone as well. Three devices would be at least one too many.
Also, given some of the places I travel through, I'd be a little worried about an Apple device, or any flashy color tablet, being stolen.*
Years ago, I used the monochrome Palm IIIxe, and then the color LCD Palm Z22, for what I now use the K3. So I'm not totally wedded to eInk. But being able to read in bright sunlight is a plus.
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* See:
http://news.cnet.com/8301-13579_3-57...tick-in-crime/