Rereading made me appreciate this crazy, fucked up ride even more than the first time. Conceptual art in book form, it has so many layers of meaning and levels to understand it on. Philosophy, the classics, psychology, it's got it all.
If you don't like to be challenged by a book, or think anything other than a straight novel is pretentious, then you are amply warned right at the beginning:

This is not for you.