What an incredible book!
It's been a while that I've read such an intresting SF. Everything inside will stimulate your brain: the culture is intriguing, the characters are great, the idea is fantastic. Also the writing is good - you'll follow and live everything through the characters action and thoughts.
The main(s) character(s) is a girl, Shayla (and I use "girl" on purpose) even if she's 26 years old. Then there're the male characters: Raif, Brennan, Kyree, Joshua, the Seven Chiefs... you'll get to know them all throughout the book. And you'll cry for them as I did.
If you loved Asimov and Heinlein you'll love it!
Read this book, you'll not regret it!