I am going to be the first one to say that this book was pretty useless for me. As what stewart said, it was just a more detailed manual. I am not saying that I am an expert pro photographer because I am not. But if you understand the basics of photography, you won't find anything that you don't already know in the book.
If you are a complete noob to photography and have about $20 to spend on this book buy it because it will help. If you get this book, there is no need to read the manual, because this book will do a better job at it. But if you have some basics background with photography, spend your money on some other books.
BTW, I bought this book for $8 at amazon.com used.