This book is written for stutterers by an ex-stutterer. If you don't consider yourself to be a stutterer (or at least one who suffers severe anxiety attacks, especially related to speaking), or one who mentors stutterers, this book may not interest you - except for those parts that deal with becoming the "boss of your mind", a process which can elevate most anyone's entire life, as it has the author's and even the publisher's.
Most problems present opportunities for growth and great victories, and the more severe the problem, the greater the opportunity for growth. So, listeners one and all, stop frowning and start smiling right now, because this book is going to help you a great deal.