Actually, I did last year at the mid-eastern Anime con (Animazement)
Went surprisingly well, excluding that whilst walking in the door, my shin pads blasted off like rockets. I abandoned them behind a potted plant and carried on without them to much success.
I've recenlly redesigned all of my armor so I can actually do some Tae-Kwon-Do in them without serious side effects. the only problem is my backplate keeps going all wonky on me if I do any kicks too high.