Overall a fast and easy read. Describes two ways people can see the world: "prevention-focused" and "promotion-focused". Prevention-focused people try to avoid losses and are motivated by the status-quo and keeping things working unless there is a real, proven reason to change things up. Promotion-focused people are focused on gains, rewards, and benefits, and they're motivated by the possibility of better opportunities around the corner. Both approaches have their strengths and weaknesses, and you can be prevention-focused in some areas and promotion-focused in other areas.
The first half of the book describes the two types of focuses, and how they affect all areas of your life - from family, to work, to making purchasing decisions, to interactions with society as a whole. The second half describes ways to determine other peoples' primary way of focusing, and how you can use that knowledge to motivate and influence them (e.g. to buy a product, to make a certain decision, to take a certain action, etc). For example, according to studies that the authors and their colleagues have done, people are more easily persuaded when the message they receive is a good fit for their dominant focus. There are plenty of practical examples throughout, which is great.
The only issue I had with this book is that in my opinion, it felt like many of the main points could have been compressed into one or two chapters. A 20-page essay, tops. There just wasn't enough material to fill a 227-page book. The chapters were repetitive, and I kept thinking to myself, "ok, this is great, but it was already discussed in the first chapter. I get it."
Despite that, it's still a good read, and provides great insights on understanding yourself and others. I can see myself referring back to it in the future as a reference. Hat tip to my brother for buying me a copy (it was a birthday present).