I use my iPad for everything from checking my email to composing classical music, from playing games to using it onstage to improvise a funk Hammond B3 solo.
That said, I have never in my life read as much as I have since I picked it up. I've burned through more books than I did when I was a Literature major.
As an ADD person, getting to the library to get books was hard enough -- returning them on time was nigh impossible. Getting to the bookstore would never happen. But buying books that I want to read as soon as I hear about them? Win.
I don't get the argument here. I mean, I understand it, but I've never had that issue. All the arguments for e-ink are bunk for me, I have no problem reading on my ipad for hours. Barth, Pynchon, even Faulkner.
Battery life's never been an issue, I've never gotten a headache, all this FUD is pretty lame, IMHO. I'm glad you like your paper book, I'm glad you like your old-school Kindle, I'm in favor of anything that gets people to read more, but really -- it's a non-argument to me.