I bought this book because I am getting into the digital music business. I enjoyed reading it, but I didn't much care for the wording in the book, and I think the authors are overreaching in the sense that they are expecting too much from artists in the industry.
This book clarifies the differences between the record and music industry, and emphasizes the effect of file sharing on digital medias (Limewire, Bearshare, programs) and the record industry. It makes some significant points, and makes the same points again later on in the book. The author states that artists should be able to sustain careers rather easily without "getting signed" and that is not the case today. Artists still need capital for marketing on the internet, and in marketing it is possible, but still costly.
This book is worth reading if you are getting into the business. I don't regret buying it, but I think other books may have a more definite impact on the reader. What it boils down to is opinion, and mine vary slightly in some cases and greatly in others.