FWIW, I've just today replaced my 650 with a T2.
Deciding factors for me; integration with Evernote (I use Evernote a lot), all my books (100's of them) are in ePub format, I like the tags/series functionality on Sonys.
+ the Paperwhite isn't available yet in the UK (although I doubt that would have made a difference given the above anyway).
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