Greetings, Just wanted to add my two cents here. I used to train with one of Taika Oyata's students during my college years. This very nice gentleman could not have weighed more than 134 lbs. At 250 lbs, and with some Muay Thai experience, I was not visually intimidated. I learned quickly. When demonstrating a technique we were told to really throw at him. He could send bolts of lighting up and down my body. From a practical perspective, one or two strikes on my arms would send them hanging to my side useless before I could retract them. I agree with the prior statement that if its in your training then they are useful. The techniques are not mastered overnight. As for street effectiveness, I am a believer. Regards