"Paper books were supposed to be dead by now. For years, information theorists, marketers, and early adopters have told us their demise was imminent. Ikea even redesigned a bookshelf to hold something other than books. Yet in a world of screen ubiquity, many people still prefer to do their serious reading on paper."
And this:
"People tended to read slowly and somewhat inaccurately on early screens. The technology, particularly e-paper, has improved dramatically, to the point where speed and accuracy aren't now problems, but deeper issues of memory and comprehension are not yet well-characterized."