Hi, I used to train in Kempo a while back. I really enjoyed the style but unfortunately I had to move. The place i relocated to did not have any Kempo/Kenpo schools. They had Muay thai so I studied that and some Brazilian JiuJitsu. I enjoyed the muay thai classes alot and still train in it. I have however, found some guys in my Muay Thai class who also used to study kempo.. we all decided to try to practice our old kempo skills on the side.. we heard alot about the tracy kenpo and larry tatum series and decided to use them to help us rehash our kempo.. we decided to pitch in and get the larry tatum series but noticed that there are two sets. My question is, does anyone know what the difference is between the two larry tatum sets? are the sets supposed to be used in order? One set is titled " Self Defense Techniques" and the other is "when kenpo strikes". I know the "when kenpo strikes set is older but ive heard alot of good things about it. i dont know anything bout the other set but seems to cover the self defensse techniques. I'd like to buy both sets, but can really only afford one at this time.. Any recommendations on the sets or tapes?