e-ink is the same on the eyes as paper :
It looks nothing like a computer screen and is a very different technology.
It's physically easier for me to read on the Kindle Touch than a book with flip-pages and I can imagine this being great for people with mobility difficulties as well as adjustable text size for optimum comfort.
I don't really like the Kindle Fire, Nook Color, or iPad being called "eReaders" - they're just regular tablets and I feel they give people a poor impression of what real ereader technology can do. They might be a good fit for some people, but those who have trouble with a computer screen for serious reading should definitely consider eink instead.
When MP3 players came out, I was skeptical. But I like ereaders for the same reason I came to like MP3 players - being able to carry a large library and not having to choose. If I bring a book to work and finish it, I don't have to wait to start another one. And it fits in my tiny travel bag.
Also, it's weird - but it makes me more likely to read. I have ADD and not having to turn pages and lose my place and forget to bookmark it and all that - it makes reading something I'm more likely to do.
And legally free out-of-copyright books without having to leave home !
If these things can really get down in price, imagine what they could do for disadvantaged kids when combined with city-wide internet infrastructure - discovering so much from the safety of home without having to pay transportation fees.
I certainly don't want print books to go away, but ereaders offer new possibilities.