I've read the manga, through to its conclusion.
I'm not an enormous fan of it; it could have been a very good deconstruction of the "-mon" genre, but put much more stock in shock value than meaning. A whole lot of really bad ZOINKS goes down, as I'm sure you've read, but little of it is ever built up to or dealt with in a way that makes it emotionally resonant.
Take the infamous scene where Hiroko snaps and brutally murders those who wronged her: this is a character that appeared maybe once before that particular story arc, and so when things start happening to her and when she starts retaliating, there's no connection to her. What happens to her and what she does are horrifying, but there's some crucial buildup and development missing and so it misses the chance to actually resonate.
The whole series is like that, basically. It's one of the most effed-up things I've ever read, but it's souless.