Hola Amilcar!
Well, I can share my experience.
About 10 years ago, going to a "transpersonal psychology" course in a school I discovered the Fourth Way. I began to study Nicoll 1 ("Psychological Commentaries on the Teaching of Gurgjieff and Ouspensky") but I was not convinced about the way they organized the class, the topics and readings, very confusing. I didnt feel confortable and I left.
But the Nicoll's book had already trapped me, and I did continue the readings by my own. My mind started to think with the ideas of the fourth way, and also during my psychology studies I realized I could understand much more with this perspective of the teaching in my mind.
Buddhism helped me, yoga helped me... yes, but it was something inside me that knew inside those books was something great yet to be discovered that at every time I began to read them again, something powerful started to shine inside. And buddhism or any other self-developement workshop that I did, was not so powerful as the content of the fourth way teachings (my personal experience, not saying that is objectively better)
I found another Fourth Way school, about some years ago and that was the begining of my self-transformation.
And now, I can tell you there are 2 different things involved. One is the teaching, as you can read them in the books, Gurdjieff, Ouspensky, Nicoll, and.. I can add other followers like Salzmann, Orange, etc. The other thing completely different is a Fourth Way school in our days.
It is simply because schools are made by persons like you and me or Leo perhaps that has so many years of self-developement, study and practice, and that produce the school goes in the direction that the director choose based on his own personal experience. So each school is a result of the level of consciousness of his master and are not for everybody.
My advice, as a monk with his kung fu master, that takes all he can learn from him until the point he really and deeply realizes is not learning much anymore from him and now the monk needs to continue the journey to new horizons.