Loved the premise, love the writing. Second book in a row of Scalzi's I've read... don't know how I missed reading him sooner!

Simple premise, well-executed: humans are colonizing other planets, and need soldiers to defend the colonists from alien races who want the same thing the colonists want. Their recruits: retirees who get new, young bodies in exchange for their service.

Scalzi has fun with the premise, but always in service of the story. Thoroughly enjoyed the book, and look forward to many more in the series!