This book literally changed my life. Not only the way I speak to people, but the way I think of people, of what they say, and how they feel. I always knew of these little tricks and tips that are based on facts, but this book helped organize them all and place them in their proper slot so I can now utilize these new tools whenever I'm in a social environment.
This book isn't necessary for winning friends and influencing people, but I can see how it can greatly help. Just make sure that you put your new tools to work and exercise them as stated!