I have read the first two and about half of the third. Lost a bit of interest during the third one, but I really enjoyed the first. Miller was a treat as the burnt out detective. That is what I liked most about it really, the detective story in space:)
The worldbuilding was kind of cool too, with earth, mars and the belters. A "close to home" kind of space opera:). The racism portrayed between various people caused by the difference in gravity on each planet was also kind of funny:)