One more point for e-ink readers... they are rather more comfortable to read outdoors on a sunny day (which I do a lot) than paper. White paper reflects sunlig

One more point for e-ink readers... they are rather more comfortable to read outdoors on a sunny day (which I do a lot) than paper. White paper reflects sunlight all too well, to the point of being painful or even damaging to the eyes. A typical e-ink screen not so much.