I'm leaning more and more towards getting one now. I must admit, I like the idea, because I'm a fast reader and get through loads of books at the best of times, never mind on holiday, so it would certainly save lugging so many books around.
I do think I would miss actually having a "book" to read though. There's something special (to me, anyway) about having a nice, new book and the physical act of turning the pages, etc. Does that sound daft?