Well, I second that...those were graphic!
I know that anytime discussions like this come up, some always say that you can't replicate a real fight. I agree. I mean, if we did, we'd be short some training partners and probably be locked up somewhere. However, I think that we can, safely of course, come as close as we can, without the fatal injuries.
Now, I've never attended Peyton Quinns courses, but from what I've read about them, people say they're well worth the money, and create that mindset that we often face in a real situation.
I also think that using the right tools is important. While it may cost you some cash, I would rather spend the extra and get a solid training tool, and put my money on something that may not work. They're not going to kill you, but the no-lie blades and shock knife are 2 tools, that if used correctly, can make you more aware of what knife defense is/is not going to work.
The downside to these training tools is that if you do get 'cut', you probably won't react the same way as if it was a real blade. However, if I had to pick between the rubber training blade and the 2 that I mentioned, I'd go with the other 2.