First, a word of warning to potential readers...This book is NOT politically correct. If you are easily offended then don't read this. But if you are tired of overly PC books and enjoy some slightly warped humor (kind of at a high-school boy level, but with occasional humor with deep insight), there is a good chance you will enjoy this.
Some of the high points: Imagine a Marine drill instructor training recruits on an overly PC world. This alone was worth the purchase price of the book.
I also enjoyed lines like "All they needed was the right mix of thrust, luck, and a complete disregard for physics." This is usually an important part of any science fiction, but it was refreshing to see it acknowledged out loud.
Many of the kinks from the first few books are finally getting worked through, and the stage is finally set for several interesting possible stories. I look forward to future efforts. Characters are becoming more complex, and the plot had a few surprises.
Enjoy! (unless you are part of the PC police, in which case I say Ignore!