This book is used by lots of education departments etc.
I am surprised you could not find reviews, as I hear about it ALL the time. It is a great book.
And very true in what it details as class differences.
How would you summarize the usefulness of this book? Is the world, or anybody's world, different or better due to the "use" of this book? How would the behavior of someone "using" this book change as a result of such use?