I have been considering an e-reader for a while.
Primary needs - something I can hold with my right hand, in a suitable position that I can do a couple of hours reading.
(many have controls where my fingers need to go, having sloping/tapered edges, or are just too big to get my fingers around the back to hold them that way.)
Follow that with at least 24 hours battery life and a screen big enough to show a full (paperback) page at a viewable font such as is usual on paper books.
I tried a Sony and a couple of other 6" screen readers - so much fun scanning around while trying to look at a PDF with pictures, or follow the wires in something like a diagram of something such as wiring for a photocopier.
There was a nice twin screen mini-laptop/netbook, but that seems to have been 'discontinued', shame, ' cos it looked to be a reasonable alternative avoiding the 'marketing' inspired problems of the ebooks, but admittedly at a price.
Me - I'm still looking - maybe xmas 2013