The trick to using these is to have your partner hold them properly. This means holding at the proper angles for round house kicks, hook kicks, various punching combinations.
If you train with proper techinque you build bad habits, that are hard to break. Karate is a different form of Martial Arts that has some very elusive methods of attacking and countering. The dude in the video has a few things to work on, but he is well on his way to his