This review is only on the Sound, as i agree with almost every other review, so read those instead :D Apart from beeing very outstanding overall, what struck me most in this anime was the sound. I cannot really describe it, but the OST is getting used very fittingly everytime. There are scenes where its completly silent (because nothing is happening) and then the sound just explodes. The Soundworks and volume is just as extreme as other parts of this fantastic anime, when a wall gets broken near the camera, it tries to break your speakers/headset. That felt very refreshing, because every other series i watched limits the sound tofit the picture.
I can only recommend this anime.

PS: I was also very surprised about the end, but its a very good end.