I finished Revenant Gun. Kujen is my favorite. Probably due to my fondness of mad scientist villains who want to be immortal. Also because I enjoy characters who have a sense of style. And because I love villains who are clearly enjoying themselves while being unaplogetically ruthless.
I think this trilogy does a good job with its reveals. There are usually multiple plot-related reveals in this book and in the larger series, and I appreciate the way they're constructed to both illuminate details about the worldbuilding and function as satisfying twists and turns.
This series is quite consistent in its style and quality, so I think whatever a person's opinion of the first two novels are will likely transfer over to this one as well. That was certainly my experience. I enjoyed the fantastical math/science/engineering aspect and how that was employed throughout the series.
I feel the second half of the novel is where it really picks up for me--the first half is a bit slow for my taste. I'm a very impatient person so this is something that makes a significant difference to me. Though I've still read much slower novels.
I would have liked for a certain plot thread to have received more attention. I'll have to see if maybe there's a satisfactory conclusion for that one in Glass Cannon.
Anyway, those are a few of my thoughts about this novel.