It looks like a great idea for e-textbooks. Especially if you were able to take notes on one screen.
My thoughts about weight are that as long as it weighs a lot less than lugging your physical textbooks around, you are better off.
I also like the two screens idea, if only because it might make it easier to take notes than trying to split your tablet PC's screen.
I also like the idea of the screens being detachable. That way, if you do manage to break a screen, the book itself is still useable, and you only have to replace or repair the broken half.
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