Are you able to give a short summary what it's about? I've had a few people saying it's fantastic and very special to them but I didn't really get much of an answer why. And trying to find anything on the internet hasn't been successful to the point where I get what's so appealing about it.
I could of course just try reading it for myself but it's currently in a backlog along with quite a few other books :P
Are the user levels an actual defined thing and are there more?