For me there are many, many valuable lessons in this book. Not only does it provide a step-by-step explanation of how to run software reviews and how to get them accepted in the organization, what is even more important is that everywhere the "why" behind choices is explained. That allows me to transfer sound principles to a wide variety of settings. In every company reviews "work" slightly differently, and this book has helped me figure out how to match the implementation to the specific setting.
Quite apart from the great content, I found the writing style a delight: witty, chock full of wisdom, and a breeze to get through. At over 400 pages it "looks" like a tome, but I went through it like a breeze. And I keep returning to it, which says a lot about the depth of coverage. Handbook of Walkthroughs, Inspections, and Technical Reviews: Evaluating Programs, Projects, and Products