i enjoyed A Closed and Common Orbit even more than the prequel one. (which has not enough story to keep up--for my taste at least) i think of it as a kind of double bildungsroman, with two developing characters between which the novel is split.
Chambers connects her scifi(-world) convincingly and smoothly with the problems most of us are facing and can relate to. it's how scifi should comment the present. and although the focus is always on the personalities, there are also a lot of social themes and thoughts.
a lot of readers mention the caring characters throughout the story, which make it so satisfactional to follow. I can support that! but it would be sad to think, it's just another form of escapism, a tweak to the genre. this is a shortcoming of understanding the themes Chambers is working on.
the real impact makes Chambers skill in building up and writing emotional scenes. and because i was listening to the audiobook: R. Dulude did a great job on this one (too).