By reading this book, you will find out that our modern life is nothing more that a bunch of non sense, on the other hand living like a warrior is more challenging than any task that you could imagine or find in your life. If you are prepared for that challenge this book is definitely for you, otherwise do not spend your time on this.
Relating to the Castaneda's work, I really think it is an important piece of work but Castaneda rarely gives a practical approach to Shamanism except for his work on "Magical Pases". I really think Sanchez's work is really a great contrubution in this field since he has filled the gap that Castaneda left in his work which is the practical stuff. In my personal opinion Sanchez has not "stolen" anything from Castaneda, he just made it better and that's a terrific contribution to cosmic consiousness in planet Earth. Thank you for your teachings Victor!
Go for this book, you will not be disappointed in anyway.