I finally got to watch the 1st season of this on Danish Netflix earlier in the summer, and enjoyed the hell out of it - the interplay between the detectives was amazing, and I loved the frequently comic moments in the bleak nastiness.

Can anyone tell me if subsequent seasons are worth trying to find here in the US?

I think they're all great, and definitely recommending seeking them out. I prefer seasons 1-2, story wise, but the 3-4 are also very clever, and further develop Saga's character in poignant ways.

Kim Bodnia leaves after season 2, and is certainly missed, but Thure Lindhardt, who replaces him in seasons 3-4, is also excellent, and a more complex, less trope-based character (though he does have a traumatic past).

Being very honest, the first season was by far the best for me. I enjoyed and watched the remainder, but the feel of the first was incredibly difficult to replicate.

I would still recommend watching the rest.

Really enjoyed that, [The Tunnel](https://www.imdb.com/title/tt2711738/0) is also the same theme set in the Channel Tunnel which is also worth a watch although not quite as Nordic Noir