This is a manga that gets better and better as it goes on. It's certainly not for everyone, but give it a try or two--I gave it a second chance (hated it on my first attempt, but it somehow stayed at the back of my mind) and to date, I can say this is one of the best manga I have ever read.

A couple of things:-

(1) The art doesn't have a consistent quality. The covers and the first few pages are good and neat, but the rest are pretty raw and untidy and looks as if the artist didn't put a lot of effort into it. In the beginning, this was quite a turn-off for me but I eventually grew to like the style.

(2) The plot and esp. the characters are far from what you'd find in a typical manga. But I think it's a good thing, in this case. The series is roughly episodic and may be separated into several arcs, usually focusing on an individual case and its relevant characters (either the enforcers or their targets.) There is quite a bit of humour in the writing, but perhaps not everyone will be able to pick up on it.

At the end of the day, this is a manga that can weird you out and make you think, is funny as well as sad (almost approaching tragedy at some points), and I think this is why it's such a great manga, because it's working on so many levels and manages somehow to pull it off. A final caveat: the sexual content is quite explicit, and more revolting than erotic IMO. Don't let that put you off the manga though--you may eventually develop a taste for it =p