I have talked to a fellow who said he has.
His determination was that its fine if you have a larg knife.
Personally - I'ld go elsewhere.
Gunsite's Edged Weapons classes are 350.
Thats a lot of scratch to learn who to use your Spyderco Clip it.
I suggest starting with the Gunsite video, edged weapons 2... Then if your still wanting more - contact your local martial arts gurus.