Yes! could have been more appropriately titled as Influence 2 because the book is simply a series of brief examples that illustrate Professor Robert Cialdini's key principles described in his book, Influence (social proof, authority, commitment/consistency, scarcity, reciprocity, and personal liking). If you loved that book and want to dive deeper into its lessons, Yes! is a perfect choice.
If you haven't yet read Influence, I recommend that you read that book before this one. Without Professor's explanations of why these principles work, the case histories in Yes! don't seem so special and interesting. Otherwise, you will probably just see Yes! as a bunch of unrelated stories, many of which don't apply to your marketing challenges. I would expect most people who read Yes! who haven't read Influence to rate Yes! with three stars.
When you do read Influence, be sure to get the latest edition (the fifth edition came out in August 2008). Otherwise, you'll miss out on insights.
I hired Professor Cialdini to speak to one of my research organizations, Share Price Growth 100, a number of years ago and the members rated him very highly for being able to apply the lessons of his research to the financial markets. I was intrigued to see some financial market examples in Yes!
Be more persuasive in getting an ethical point across!