I heard of this book when I was in college, but I never got the chance to read through it until now.
I had to give it a 4 instead of a 5 because it his writing style was a little difficult to understand, but I understood his main thrust- that believers are in union with the exalted Christ, and have delegated authority over the devil and his work. This delegation of authority is not us having authority in and of ourselves. Ask the sons of Sceva in Acts 19- they tried to exercise authority over demons, but they couldn’t because they had no living union with Christ in salvation.
Neither is this a “name it and claim it” concept of the Pentecostals and Charismatics. Rather, as we walk in the Spirit, seeking God to destroy the devil’s foothold in people and in difficult situations, we can stand against his wiles by claiming our union and authority in Christ against him. Perhaps our churches would have more power in prayer if they knew how much authority they have in Christ over the enemy. Is there a wrestling in spiritual warfare? Yes. However, when we pray we need to rest in the reality that Christ won the victory, embarrassing the devil at Calvary (Col. 2:15)!