"Have you ever re-read a book and found that your opinion changed?"
I think I can answer this questions with a no. I don't like to re-read books, even the ones that I really, really liked. Once I've read them, I'm done and pass them along to the next reader.
The other day, I saw someone pose a question as to why they don't like to re-read a book but will watch movies over and over. The same is true for me. I've watched some of my favorite movies so many times I've lost count!