Having trained with, and been around, many Goshin Jutsu practitioners over the past 25 years, I'd say that the style is really many different sub-styles ... many factions exist after Durant's death. The most "dangerous" of the practitioners are probably those connected to Master Bob Bohack ... he's an exceptionally-skilled martial artist. When you get down to it, the Goshin Jutsu "system" is an evolving (again, splinter-grouped) traditional-type karate system, with added elements of ju-jutsu and bu-jutsu. Certainly, it seems to contain more street-techniques than Tae Kwon Do ... but it is no Muay Thai or MMA. I have, though, experienced and noticed some hard training practitioners. Just my thoughts ...