I go back and forth. For public domain books, pretty much every time, I will read them in e-book format. I like to buy my science fiction books in paper at Uncle Hugos. If I can get it cheaper in paper, I will. Unless it is an old copy with yellowed pages and tiny font, that's just not worthwhile. When e-book zealots get too insufferable, I read more paper books. When the paper book zealots get too insufferable, I move back to e-books.
