I don't like self-help books, I regard them (probably because of a very technical background) as snake oil sales tools. But I do have to say that Mr. Peurifoy's book lays a very real and clear image about anxiety, phobias and a method to deal with them.
The difference, and the only reason I took the time to read the book is that Mr. Peurifoy, besides counseling, is a teacher by training, so he lays out his book like an anxiety course (he uses footnotes, end of chapter exercises, additional recommended reading material, references to associations, etc)
The result is that I became interested in the subject and decided to help myself by understanding my situation, convincing myself about the possible routes to heal and then acting with conviction.
So... did I like the book? Yes, I do recommend it as a clearly written and practical method to deal with anxiety.