I have been asked this question several times. The book provides more than 600 pages of extensively researched findings that will help any engineer greatly increase their remuneration and job satisfaction. The book has been reviewed by many experienced engineers who have confirmed its value by ordering 40 or more copies for their organisations.
The eventual increase in an engineer’s remuneration will far outweigh the initial purchase price. One of the first people to read the book mentioned the findings in a job interview for a graduate engineer position and was offered an engineering management position instead at more than twice the graduate salary.
At around US$120, this book is probably some the best value you can find for engineers.
Online appendices (at no extra cost) increase the value when used with the book.