Third read: Man, I really appreciate this book. It stands up and I have loosened my tight grip on my views of the Holy Spirit - not that I agree with him completely, but it seems less important to care. :)
I am giving this to a friend so I decided to re-read it and it it made me realize I probably need to find my copy and do a deep re-read.
Second read: Still so good, in some ways even more so. I still disagree on his view of the Holy Spirit, but I needed to read this again.
I found that this book was a great complement to Tim Keller's "Prodigal God" - both discuss the parable in Luke 15 and the idea of receiving God's love in Christ - "Orphan Slave Son" has a more personal and practical feel. I felt as if the author here was taking all the theological knowledge I've learned about adoption, grace, and sonship and graciously pouring it from my head to my heart.
I really liked this book but probably wouldn't recommend it to every believer in my life. I was pleasantly surprised at how biblically compatible the book was; there were only a few parts at the end of the book that the average biblical Christian would disagree with [on the "baptism" of the Holy Spirit in particular]. Specifically I enjoyed how much the author emphasized the role of the church in the life of spiritual sons.
I didn't give it a 5 only because there seemed to be a lack of consistency throughout. The first two sections of the book are very general and broad [not in a bad way, just in a 30,000ft overview way] while the last section "Son" is very specific and detailed. It is all helpful, but the lack of consistency is a little jarring.
If your desire is for your theological knowledge to sink down deep into your heart, read this book.