Yeah, I've heard of SCARS, it's all marketing and from I've been told by guys that have actually been to the seminars for it, it's not even that effective. There is a high reliance on pressure point tactics that, I feel, have no place in 'combat'. Try to tap someone three times in the arm and then pinch their elbow will work only on someone that knows about the system. I have a friend, that went t a seminar and he said he didn't feel a thing and it just pissed him off. Trying the put an arm-bar while on the ground is stupid, all the enemy has to do is pull another and it get's ugly way fast. Think about, most martial arts are taught from a sporting aspect which is IMO garbage for street or combat fighting. So I'm on the ground, and trying to do an arm-bar, I'm using both my hands and arms and legs trying to sink this 'submission' while he still has three limbs to fight back with? Then his buddy/s come to soccer ball kick you in the head while you're too focued on the arm-bar. Make any sense? Now I'm all for joint locks/cranks if youre working in some type of low intensity security position, but for street and combat survival, instead of trying to subdue, why not just break the arm,wrist,knee, what have you.
I've never actually seen Defendo done in person, but from the video clips off their site, it looks like a good system. As someone said earlier in this thread, in street fights the matial arts seems to go to sh*t. It's not that the technique is bad, but how the technique is taught, along with the mindset to drop someone if needed. For true combat/street effectiveness, it has to be brutally and violently effective with a high enphasis on striking and ending the fight quickly and with the most possible damage to the enemy and dont forget all the stuff 'outlawed' in martial arts tournaments should be used.
Check out www.hockscqc.com I'm currently an intructor for several of the fields he teaches and would like to see something like that incorporated in a CF hand-to-hand system. IMHO