It's a trade off to me, I do most of my reading in well lit places but can't hack the small text in paper books. Conversely when in less than ideal conditions I find upping the text size a notch is fine.
LCDs I'm sometimes okay with but after a long day at work I don't want to look at them and most of my reading is done sitting outside a pub. No way I'd do that with anything other than an e-ink screen.
