Another wonderful Scalzi novel. I wouldn't recommend reading this one unless you've read the rest of the 'Old Man's War' novels first. 
 I think Scalzi is our generation's Heinlein (I'm sure others make that comparison too). His novels have a certain breezy quality that is really fun to read. Sure, some times he veers off in to pretty vacuous territory, but I don't care - the characters are just fun to follow. A big change in this novel is he tells it from the point of view of a teenage girl. That's a big shift and he pulls it off well. 
 My favorite word from this novel is 'unhugged'. Which, of course, is what you do when you are done hugging.