I have always been fond of Gann's methodology. His courses were somewhat difficult to understand, as writing was simply not his forte.
But, they've kept me alive ... financially alive, that is .... for more than a few years.
Coral's bond trading is where his methodology seemed to shine. He hit that long bond market pretty darned well.
Me? I'm just jealous of the GREAT W.D. Scam. Did you ever read his novel, "A Funnel Through My Hair"?