This book compiles and comments on many different models of how a person, or a group, can make a decision. For me, while there was a lot of value in some of the individual models, I thought the greatest outcome of reading this was rather understanding further, on a second-order basis, what models others rely on to make decisions.
Even if you disagree with the use of a particular model, for example, Choice Overload Theory, it is nonetheless quite helpful to know its history and its prevalence, because you can then spot others when they are in the process of relying on it in their own practice.