This is an excellent kung fu movie.
I saw this movie for the first time back around 1980. I originally went to see Jackie Chan's "Big Brawl" or "Battle Creek Brawl". I remember that as a young boy growing up in Mexico, I used to devour martial arts magazines from the US. This is how I was exposed to such classics as "The Young Master", "Snake in the Eagle's Shadow" and other Jackie Chan films. I originally went to see Jackie Chan, expecting the other movie to be a poorly dubbed, poorly choreographed, and horribly acted chop socky. Instead, I was pleasantly surprised from the get go. The choreography is excellent. The fight scenes are long and the shots are long with few to no closeups or cuts. We actually see the skill of the fighters. There is a training sequence where the main character uses the Wing Chun "Dummy" it training when he believes that everyone is asleep. There are also awesome fight scenes including fights against multiple attackers which are excellently choreographed.
I rate it an 8 only because the dubbing is pretty terrible, but if you like excellent fight choreography, as well as a legitimately outstanding martial arts movie from the seventies, you won't mind the poor dubbing.