I know that this has been discussed countless countless times already but I wanted to add my two cents.
Personally I prefer the real thing. I don't know why, but there's something about holding the actual book in your hands that makes life good :) . But, I do own a Kindle and I do use it. For example, I recently added Anna Karenina to my Kindle. That's quite the long book. In situations like that you kind of wonder if its worth it .... Well at least I do.
Anyways , my overall opinion about the topic is it all depends on your preference.