Conformed to His Image is Kenneth Boa’s comprehensive review of approaches to spiritual formation. There is much I admire about the book.
First, it is very well ordered and structured, making it easy to know exactly what he is discussing and how it fits within the broader framework of the book.
Second, rather than setting forth “the” method of spiritual formation or treating it in a cookie cutter fashion, he explores twelve facets of spiritual formation, essentially twelve different takes on how to do spiritual formation.
Third, within each facet, he presents a thorough overview of the ways each approach has been practiced by individuals or groups and asks some good review questions at the end of each section.
Finally, I appreciate the Conclusion and Appendices for bringing what could be a disjointed review together in a more holist manner. One appendix, The Richness of Our Heritage, looks at how different Christian traditions have approached spiritual formation. The other, The Need for Diversity, included a (to me) somewhat odd evaluation of the twelve facets by tying them to the Myers Briggs assessment types. I assume this could help someone (who knows their MB type) to figure out which facet will appeal to them the most or that they need the most.
Some will be turned off by his continuationist views on spiritual gifts, others will be thankful for it. It does bring an added emphasis to the role of the Spirit.
Facet 10, Warfare Spirituality, seemed to me to not be a separate method of spiritual formation as much as a common threat that all approaches must work toward (fighting the temptations of the world, the flesh, and the Devil). There are several of the facets that seem to overlap, some more than others, leaving it hard to parse out exactly how these methods might differ in practice.
Rather than evaluate these approaches, Boa presents us with a smorgasbord of options. I wish he had spent more time evaluating strengths and weakness of each. This book is a good way to sample the options, but to really use the approaches you decide on, you will need to move on to other resources; the coverage is just too cursory.