Its got its up amd downs. Eye strain has been no issue with the e-ink screen. The only thing there is it is kinda uncomfortable and awkward to hold while reading. You never notice how much holding a book is part of your sitting postion while reading. The other thing is it gets kind of annoyjng and exhausting reading one page at a time instead of two and comstently scrolling. I do find myself reading for shorter periods and getting tire if it faster than physical books or papers.
I think if it like this. The e-reader is like a walkman, the physical book is lik a hifi home stereo.
It's great though because I can read it anywhere and also get free or cheap editions for magazines, articles, and books that catch my interest butbI wouldn't buy. I prefer books and still choose books more often than not but my e-reader is nice addition to have on hand. Plus you usually get a free e reader version with a book purchase. Thats always cool because yoilu can catch a few pages even if you leave the book at home. Easier to bring an e reader than a full book to work or wherever, but when you are home you can read the physical book.