I said no, but I feel I must defend myself out of consideration for my kindle (named Clark, btw. All of my electronics ended up with Superman names- except for my car, which is the Hulk. My phone is named Perry, and my ipod is Lex because it's a stubborn and evil little piece of... machinery :p )
It's not that I don't read quicker on the kindle. I read at about the same pace either way. It's just that, for some reason or another, I get distracted so much easier when I'm on it. There's still something about a book that I can just delve into easier, and I can focus on it better.
However, I do find that it's great for reading fanfiction.