The guy who taught this class was a fellow named Jerrard Something-Polish, and he told us right up front that he wasn't an expert in this. He's out of North Carolina, so he might be one of Mr. Cohen's people... I simply don't know, and didn't have time to delve into his history.
He did his techniques well, and had the right information, but like anything you're doing for the first time and which is a little different from what you normally do, it takes some time to get into the flow of them. I just found all the technique went away if the angles changed, but I can take a pretty good nikkyo and sankyo without flinching, so my pain resistance level might have been involved too.
I enjoyed what we did, I just found it a little cumbersome to do exactly right... which it required, if it was going to work. Over the years, I've found a lot of techniques work better when you're in randori than when you're stepping through them because of the dynamic element, and I can see how those would improve with more dynamic movement. I just didn't see how you would ever go through all the steps they had involved in "getting in position" correctly.
All in all, it was still a good class.