I used my e-reader for the first time today. I spent a relatively brief time downloading free e-books from the Kobo website. I spent a much longer time trying to find available (and free) books from the library. The first of those tasks was fruitful and I now have about 31 books to read. The second was difficult because anything I wanted was too popular and was subsequently checked out. In addition, some of the waiting lists were so long that I didn't feel inspired to get on them.
As far as reading goes, it seemed rather comfortable. It certainly took less effort to turn the page--unbelievable to think of all the energy I wasted turning pages the old fashioned way. (I guess I can take solace in the fact that I probably burned a few calories the old way)
My first book was a bummer. It was really short (I read it in about 30 minutes) It wasn't particularly well written, but since it was free, I really shouldn't complain. I am on the second book, and all is progressing nicely. It is better written, and managed to keep my attention for most of the trip home.
I don't seem to have any eye strain, and the e-reader is probably lighter than any book I have ever carried on the bus, so I shouldn't experience any muscle pain. If I have misjudged this, I will probably wake up tomorrow with an incredible headache.
The only negative thing about the device so far is that way it counts pages. In a single commuting session, I read about 200 e-reader pages. I take pride in my reading speed, but that seems rather fast. The pages are small, so you blast through a lot of them.
I talked to a woman on my bus and one of those George R. R. Martin books clocks in at over 1000 pages. Keeping that in mind, I was temped to download Charles Dickens' Bleak House, but that would most likely surpass 2000 pages.
Time will tell if this device will replace books for me. Most likely I will still go to the library to check out books from time to time. I can't imagine my life without periodic pilgrimages to the library.