Finished Retrubution Falls. Wow, that was awesome! Much better than I expected, to be honest. Frey's character arc was really refreshing and authentic, as were most of the character arcs. The similarities to Firefly became more apparent as the book went on, but frankly I thought that was a plus! The world seems really big and I'm looking forward to exploring it in later books, and seeing a lot of the bit characters return.
Only one real complaint...The female characters seem to keep getting the short end of the stick - getting sexually abused, or worse. There weren't many of them to begin with, and they don't get to have nearly as much fun as the male characters. The world of the Ketty Jay definitely seems to be a grimmer, more painful place for women than for men, and that makes it much harder to enjoy the cheerful, rollicking tone of the book's high points.
Anyway, overall, great book, and I'm looking forward to picking up Black Lung Captain!