None that I can see other than taking up extra space. I read a lot and just love to hold a book and read through the pages. The electronic readers are OK, but I just like the feeling of a real book in my hands.
Disadvantage of books?
I personally love reading, I think its fun going on adventures with out leaving the house. But their are some disadvantages. Like when you travel books can be kind of heavy and big. It might be hard to cary around. Thats like the only one I can think of. :)