I bought this book because I saw it recommended by Steve Harrison in How to Do Better Creative Work. Steve's recommendation carries a lot of weight to me. It also helped that I already knew Jon Steel's Truth, Lies and Advertising, and learned a lot from it.
I must say the book doesn't keep all of its promises. It is presented as a guide for preparing any kind of business pitch. I don't think reading it will be harmful if you typically pitch, say, small construction contracts with local companies, but I doubt it will be immensely useful in that case. If, however, you work in advertising, as I do, you should definitely buy it.
As one of the book's main strengths is the author's skill in illustrating his points with great stories, most of them coming from his experience in some of the best ad agencies in the world, reading them is totally worthwhile if you belong to the same universe. The very process of planning and creating the campaigns is described here with much more depth than it would be necessary if the real subject was "the perfect pitch" in general - for any business, not only advertising.
Also, it may be frustrating for the average reader that all the examples suppose a wealth of resources in preparing the pitch that most individuals or companies can't even dream of. Having your whole company working on a pitch for months, shooting lots of videos or creating a hollywood-style setting in a hotel room is something you can afford if you are aiming for an automaker's global advertising, but not in many other cases.
That said, I'm not complaining. This is a great book and I recommend it. I just think it won't be as interesting for people outside advertising as it is for me.