It seems most of us are in agreement about paper instructional books.
I have a kindle and had a few books put on my kindle that were quilting and cooking books. Never again. Haven't a clue how you would get them printed out, if you wanted a pattern. The only cookbooks that I have on Kindle were free books and I have to say that they usually aren't worth buying anyway and have been mostly deleted.
I don't mind reading a mystery book on Kindle, since I mostly read at night and like not having to have a light on.