This is an excellent exposition of the differences between the Lutheran and Calvinist traditions. Cooper, as a good scholar does, took the time to fairly represent the Calvinistic views, and even asked living Calvinist scholars to ensure that he represented their views fairly, avoiding the strawman fallacy and providing a great steel-man. Nevertheless, Cooper convincingly shows why the Lutheran Reformation was the Conservative Reformation which retained the Patristic and Medieval witness, rather than making overcorrections as were done in Geneva, Westminster, and other Reformed epicenters in the 16th and 17th centuries.
If you find yourself like me, having become nauseated with Baptists and Presbyterians debating covenant theology, Calvinists and Arminians debating the nature of the relationship between predestination and free will, and want to explore an introduction to the too often neglected richness of the Evangelical-Catholic tradition as it stems back to the New Testament, and runs through the Patristics and Medievals into the Reformation, than this book would be highly with your time.
I also recommend this book especially to my Calvinist friends. Unfortunately, the Lutheran theological tradition, like many other theological traditions, is often represented by bad straw men arguments from people who are far from well-read in the tradition, and who have no business attempting to represent the beliefs of the Lutheran Book of Concord fairly. In stark contrast to that, Jordan B. Cooper is a Lutheran scholar and theologian who is well worth engaging with, and if he does not change your mind about Calvinism, then he will certainly help you develop a deep respect and appreciation for the Lutheran tradition, which you should be willing to cultivate.