I've thought about recording some of my rank demonstrations but never did untill my recent Shodan demo. I was suprised in that I actually looked like I knew what I was doing.
I was also able to look and see where I have room for improvement, which was nice. I think that it is a tool that could defenitely get more use.
I really like Clark Sensei's method of using a grid and slo-mo playback. I my try and emulate that in the future.