This book has much to recommend it - readable yet with somewhat of a quantitative approach to finding better ways to deliver value to customers.
Its' real worth is that it takes a view that requires the inclusion of the needs of the customer in the process of strategy development.
Too many books describe a process to improve the product or the supply chain without asking the most critical question - will anyone actually pay us for making these changes ?
If it has a (slight) shortfall, the book does not apply the same detail to integrating the needs of the customer to the decision making process. However, this is overcome by the sound way in which Gale seeks to assist us in finding ways to drive value for the customer.
Worth the investment - it does require some effort to read, but most worthwhile books are like that.