This looks like a fantastic, meaty (432 page) resource for pastors and counselors, and those in training to serve in those vocations. Powlison is highly qualified to write such a book, having (years ago) written a Ph.D. dissertation on Jay Adams and his contribution to the emergence of the biblical counseling movement. If you’re not familiar with it, Powlison gives both praise and some constructive critiques of Adams’ emphases with regard to the Bible, counseling, and the emotional life in general. Another place to get a good introduction to David Powlison is the three lectures he gave at the 2001 Desiring God Pastors Conference, available for free audio download.
Here’s a brief video introduction to The Biblical Counseling Movement: History and Context from Dr. Powlison himself: