I finished watching this some weeks back and I was quite impressed. It has such an eerie feel, really goth, which I thought would suck if it was so constant, but they really managed to balance it out. It's also quite an intelligent anime too, it has the usual 'message' type thing, but is in my eyes a more realistic one, dealing with more personal issues that most animes gloss over with either overly complex or too simple answers.
I'm not one who usually watches this sort of anime, because I expect lolita fashion influenced, pretty boy type rubbish with no real story, but I'm really glad I watched this. Once I started watching I couldn't stop, so definitely check it out and that goes for those who put this off for either the reasons I already stated or some other reason, just give it a try.