It's a nice little book. It served as a great first introduction to GoLang for me. The beginning chapters almost feel like they are written for total newbies to programming. Toward the middle the book becomes more interesting, and the concepts of defer, panic, goroutines, packages, etc. are explained in a short but clear way. Toward the end, especially in the chapter on core packages, it feels very rushed, but that is to be expected from a book like this. It does a good job at what it claims, and provides a quick tour of GoLang for the intermediate programmer. It's by no means sufficient though; you'll either need to read more or dig into the GoDocs and the source code.