So for me, having both a touchpad and a kindle. First the LCD doesn't give me more eyestrain than the e-ink, but I think this is because I adjust the brightness to match the ambient lighting, and I read on the touchpad with colors inverted (honestly as a long time coder, reading on emmissive displays should be done with a dark background, my preference being green on black for nostalgia.)
The LCD is essentially unusable in direct sunlight, but the e-ink is not usable in low-light without an extra light source (I guess I could add a shade for my touchpad.)
As for battery life... I guess if I get another conference in Bangladesh I should take the kindle. But even there I found enough power to keep my laptop going and it only lasts 2 hours on battery. My point is, the touchpad lasts for a day of moderate to heavy use, beyond that what do I care if I have to drop it on the charger overnight? Of course I'm a little spoiled with the touchstone charger dock that I use to hold the touchpad on the nightstand whole I read in bed at night, maybe if I had to deal with a cord I would have a different opinion.
Overall, I have read 17 books (just in my kindle library, not including PDF papers and such.) on my touchpad since I got it in the fire sale, and 0 on my kindle, in fact I'm honestly not even sure where it is right now...