Finished. Some spoiler-free thoughts:
Really strong start & really strong finish. My main nit is that there are a few story arcs in the middle that were a little bit unnecessary in the end, and that time could've been used better. Other than that this was really good. It didn't quite have the magic of S1 for me personally but in the end I was invested just as much as I was in S1. The detective/investigation part of the story is a lot better/deeper than S1 imo so people that love those type of shows will probably really enjoy it.
Overall I think this is my favorite second season of the recent shows that start an "entire" new story in S2. Can't think of anything that comes close. Good to know it can be done
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In case anyone is curious, in spoilers the links to S1 (written in a way that wont ruin anything):