A veritable classic that every sales professional would do well to read, particularly those who work in complex sales as account managers, and those who have an existing book of business. It won't guarantee success, but it'll provide a solid foundation with which to approach every sales opportunity.
For hunters responsible for net new business, and those having to build up their own book of business this is a great supplement, but in and of itself will not be of much help for the critical first step of the process (i.e. prospecting and getting meetings). Nevertheless, the book, and the program, are highly recommended, and understanding the concepts, which are laid out with excellent logic and practicality, are well worth learning.