Unfortunately, I cannot recommend this book.
On the chapter on relationships, the author notes that the average household has 217 arguments related to dishwashing every year. His comment is "1. Some of our most persistent disagreements are those with whom we are closest. 2. They are waged over trivial matters. Both phenomena were strange."
This is bizarre, given the huge body of research that shows women disproportionately bear the 'invisible load' of emotional labour and household tasks.
The author does not address these or dynamics. He seems, frankly, to simply not know about them. As such, the book is fundamentally flawed.
He may have a number of insights when it comes to debating. And maybe you may find his techniques useful at work. But when applying these to personal relationships the thinness of his personal experience and his research shows.