This is a masterful and well-researched exposition and analysis of Pentecostalism. Pentecostalism and its daughter, the Charismatic movement, dwarf the Protestant movement, claiming 500,000,000 adherents worldwide, virtually all of them gained in the twentieth century.
This is the most useful book in my library for use in understanding the role(s) outlined by Scripture for the Holy Spirit. I have read all, and re-read portions of it over and over for about twenty years, and find it invaluable for providing understanding of Who the Spirit is, and what He does.
The primary context for the book's writing was as an extension of the author's doctoral thesis, which had focused on a Biblical examination of the tenets of 20th century Pentacostalism, as they touched upon the Holy Spirit and His role in the Christian's life. In that sense, I agree with the above reviewer Steve Cowden that it's about Baptism in the Spirit, although I would go on to say it addresses much, much more, and very well, at that.
I believe that, like me, you will find that Bruner demonstrates from the text of Scripture that the Spirit is, in fact, the Spirit "of Christ" (i.e., stamped with Christ's image, or "personality" if you will), and that it's work is about glorifying Jesus and making Him and His will known, rather than seeking to glorify Himself (i.e., the Spirit).
Furthermore, Bruner argues (successfully, in my opinion) that we are given the Spirit, NOT when we seek it, directly, but rather when we seek Christ (for instance, see his exposition of Paul's letters to the Christians in Galatia and Colossae). It's a similar principle to C.S. Lewis's "Surprised by Joy".
This book has been out of print, but I see now that Amazon is selling it again. I am going to buy another copy TODAY, because my old one is literally falling apart. [This is also one of 2-3 books I have actually bought copies of -- and they were used, when I could even find them -- to give to friends.]
Get this book! Read it, and you may find yourself buying more to give away too!