Overall, an excellent look into the economic, social, and psychological reasons why people decide to follow the herd and why some don't (though it could be argued that contrarians are really just choosing to follow a different herd). The chapter on mavericks was very interesting, as were the sections on economics (which I didn't expect when I initially began reading it; I had been expecting it to be strictly a psychological book). One of the things I like about this book is the repetition of concepts, because the material is a bit dense; so it's helpful to have reminders of what Bayesian reasoning is, for example, when it's brought up in later chapters, and where in the book to find the concepts, should you wish to refresh yourself deeper.
The author clearly holds an evolutionary worldview, so that's an unfortunate, unscientific, and historically inaccurate perspective brought into the evaluation of copycats and contrarians, particularly in chapters 4 and 5. The author views mankind starting out as primitive beings who evolved herding strategies as they struggled to survive harsh conditions versus a more intelligent creation who was speaking in full sentences, farming, and developing complex societies from the beginning of time, as taught in the historical book of Genesis. The author theorizes that mankind has not had sufficient chance to adapt to "modern institutions like markets and government, and modern artefacts such as money and computers" (p.125). While computers are certainly a more modern invention, mankind has had monetary and governmental systems for much longer than the author apparently believes. These concepts are laid out in the history of the ancient Israelites, including pre-Israel as a nation, in the Pentateuch.
Another criticism of the book is the section on fake news in Chapter 8, as the author cites the left-leaning PolitiFact rating most of Trump's campaign statements as "mostly false" and Hilary Clinton's as "true" and "mostly true." Ultimately, for one to really determine if someone is stating something true or false, we cannot fully rely upon fact-checkers that have just as much bias as the next person; so it's difficult to fully accept that section at face value. I highly suspect bias against Trump in the PolitiFact study. There's also mention of democracy, which is a common misconception about the American political system. The USA is a republic with democratic principles, but we are not a democracy, as "The Federalist Papers" describe the difference in great detail. When delving into the psychology of people making decisions within the context of our political system, a proper view about it is warranted.