I am a certified trainer for both Influencer and Crucial Conversations. I like both and use both but Influencer is the most practical and provides a model that you can start using immediately.
I first became aware of VitalSmarts when my employer rolled out Crucial Conversations training programme. I became certified to deliver this class which involved reading the books and training materials. I felt this was over-complicated and although I found myself using the models and techniques more often it took effort.
I read Influencer and immediately I felt the model was simpler and more practical. I was able to take the 6 source model and implement it in business, it is also very adaptable and I am finding myself seeing ways in which I can use the model. It is also very straightforward to explain to others and get them interested to learn more or try the techniques.
As a consequence of reading and using the model I have since taken the Influencer training to become a certified trainer. The difference is that unlike Crucial Conversations, this was my decision.
This book is not a psychology book, but it does use research grounded in psychology to demonstrate and support the model. Reading this book will not make you a master negotiator or enable you to get what you want every time. It will give you a simple six source model that can be adapted and used with individuals, teams and organisations.