Brilliant. I felt it was very well captured and all timed out very nicely. The story consists of tragedy, betrayal, belief and one's rights.
The art is beautiful, a real trademark of CLAMP's artwork.
Characters are great too, as none of them seemed to lack personality and held real emotion within the story.
I suggest reading Toyko Babylon (the prequel) to understand a few character's situations before watching this. I didn't, because I didn't know until afterwards. :p
Probably my favourite, if not one of my favourite series'.