The original book - very good. The add-on - overrated and not worth it.
The author have spoilt the whole book by adding a reprint from the book and making the book worse than the original. Being a scientist one could very, very easily have had a coffee with two-three colleagues and come up with the same conclusions.
The only thing that is for the authors: Congratulations for making a good book worse! and to the people (like me) who bought this book - You have been fooled!