The 4 armed attacker randori was exceptional imho. Would be even nicer if not so choreographed imho, but great nevertheless.
The Jyu Waza one was great too in that same light.
The Tanto Dori was ok. Would tend not to use tai sabaki that presented my back to a knife weilding attacker though. I think it was a good demo of someone who wanted to intimidate a person with a knife but not really hurt them (as seen with the twirling, telegraphing, presenting of the blade before attack etc.). All in all though it was not bad. Good timing on the part of Tori in some shots and Uke makes things look really good too.
I haven't downloaded the rest of the vids yet, but it looked like a great demo overall.
Keep it up.