This book focuses more on the business side of game audio. If you are looking for a 'how to' guide for composing and sound design, this is not the book for you.
However, for anyone interested in making a living by creating game audio content, this is a must read. Everything from networking, pricing your services, to standard contracts are covered. Of particular interest were the interviews throughout the book. Some more famous personalities, such as 'The Fat man' were interviewed, as well as some lesser known composers and sound designers. Some of them list what gear and software they use. I was surprised at both the spartan and the over the top set ups that some of these guys have.
The disc that comes with the book has some very useful content. Perhaps the best was the demos provided. If you are serious about composing, listen to these demos, they will give you an idea of what skill level you will need if you want to get any jobs.
Just a side note, at the end of the book Aaron suggests that you send him an email. I did, and got an encouraging response back from him. So he isn't just pretending to be a nice guy in the book, he really is!