If you have not yet read Influence, I recommend you read That did book before this one. Without Professor's Explanations of why thesis work principles, the case histories in Yes! do not seem so special and interesting. Otherwise, you will probably just see Yes! as a bunch of unrelated stories, many of Which do not apply to your marketing challenges. I would expect most people who read Yes! who have not 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!