I like books and i've got a lot of books. both for fun reading and study, but for at least 3/4 of what i do with books, the ereader is a lot easier.
as for kids, yeah, when they are on the gruffalo, then you can't beat the big paces with piccys, but once they are onto the kind of chapter books that don't have anything other than black and white line drawings occasionally, then a kindle can work. well, it seems to be working so far for the 7 year old. who got one for her birthday that's got a couple of hundred torrented books on it.