Here is the deal Hugo - most of the people have to go to work in the morning, and we do not go for full head strikes in class.
Like I said, I have done martials arts most of life, including TMA, BJJ, etc, and for me, this works the best. Whatever floats your boat.
Additionally, most of the class are military, law enforcement, special forces, and use this stuff every day.
Its based on WW2 combatives of Fairbairn, Rex Applegate, and Sykes.