The book focuses on visualization, and dynamic hand evaluation. Don't just count high card points. Think about what you have and how it can be useful when combined with your partners hand, or not. Don't be blinded by lots of HCP and no fit, and come alive with few HCP, but with shape and values in partners suits when they show a good hand.
Advanced players already know this, they don't need this. It`s the 90% of the players who are not advanced.
Excellent value for the money!