In a word, this is terrific from beginning to end. Amidst all the rampant publicity for the overhyped (and ultimately disappointing) 'Attack on Titan', this one is the real deal.
If you want and appreciate hard SF, this is for you.
Yes, its ambience and themes owe much to classic cyberpunk and Philip K Dick's novels - it even knowingly, with a wink, cites William Gibson's 'Neuromancer' and Dick's 'Do androids dream of electric sheep?' at one point. But it puts all these classic ideas in a blender and manages to come out with something new, twisty and exciting. Think of it as a natural successor and counterpart to the classic 'Ghost in the Shell' and you won't be too far out...
The animation is fluid and engaging, with mercifully restrained use of CGI. The characters are well fleshed out and interesting. The technological projection is well thought-out and wholly credible. And the genuine moral and ethical themes brought out in the mix are treated both seriously and fully. OK, there is some violence and gore; but this is not one for the kiddies anyway!
A fully realised future - without aliens, giant robots and constant explosions is refreshing enough in itself, but this anime one goes further and - like the best SF - manages to comment on the present and ask serious questions about law, order and morality.
In short, this is one of the finest animes I have seen in many years. It's just begging for a second series. Sibyl is still there, and must fall... Will freedom or order triumph in the end?