Hi,
I've been looking at the same question and my conclusions so far are:
I can use an 6inch E-ink reader for reading books (fiction / non-fiction with no or few pictures) but I don't want to use it for any other kind of text reading. It took a while to optimise it for reading (customised fonts, line spacing, scaling text size) due to my aged eyes not coping well with small text.
I plan to buy a larger size tablet (8" to 9") as a "text information device" for reading text from sources other than ebook files (e.g. PDF, internet blogs, internet news websites) and the key factors I am considering are PPI greater than 160, weight under 400gms and battery life greater than 6 hours. This may or may not help.
Paul
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