I have both. I highly recommend the DX for reading - esp. if you are concerned about eye strain. The large screen has really helped my tired
old(er) eyes - esp. since I do most of my reading at night after working with PC screens all day. Also, depending on the font size you find comfortable, the DX can markedly reduce the frequency of page turns needed while reading. I also enjoy being able to see an entire page (look back up at previous paragraphs, etc.) while using fairly large font sizes.
The K2 is approx. the size of a paperback, the DX the size of a hardback book.
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