I can whip around two sets of chucks rather briskly, I have fought with them and the outcome was excellent, when I use chucks in a fight I will only use one set, I have thrown a set to someone that was talking shit, while he was trying to figure them out I broke several knuckles on each of his hands for him.
I would hate to get in a fight with a person who is trained with an edged weapon, I believe that once they are within 10 to 12 feet of you, you will get cut before you can react, I heard this from a friend of mine who is a state trooper, he said that when a person with a knife is coming towards him he is taught to shoot before they get within 12 feet.