I've got a Kindle Paperwhite which I've used every so often but I still prefer 'wads of dead tree' books. I bought it thinking 'hey this is the future!' and expecting myself to get a lot of use out of it but I just haven't really. Last five books I've read have been physical copies. The only use I really get out of it now is if I want something on short notice and am not willing to wait for a physical delivery, which isn't often.
People cite the storage space of e-books as a plus for using them over paper books, so you can have lots of books when you're on the move. I've never understood this though. When I'm commuting to work, or travelling on a plane or something, how likely is it I'm going to read two or more books in one sitting?
I can see it if you need lots of technical texts at hand for reference or something, but most people use e-books to read novels and I don't understand why you need your entire library of novels at your fingertips while you take the train 40 minutes to another town. You're not going to read two or more books in that travel time.
If I'm sitting at home I will always prefer a hard copy of whatever I'm reading. In spite of how awesome people claim e-ink to be now I still find it much easier and more relaxing to read from paper, especially if it's a technical manual. Perhaps it's because I'm staring at computer screens all day at work, and when I program at home or play games. The last thing I want when reading for pleasure and to relax is to stare down at another screen.
Plus there is something meditative in the act of reading from a physical copy that I just don't get from an electronic device.
Then there is the issue of DRM which I am against in forms, and the dumb prices that are charged for e-books.