Great for you, but if you haven't tried it, there's no way to know for sure. An experienced scientist doesn't say "oh I've seen enough it def works" until he/she has thoroughly tested it. Fighting is the same, except now your life might be on the line.
You also haven't said anything about grappling, and few CMAs have grappling instruction worthy of a rating of 8. Would you care to explain that some more as well?