Action Discs

Has anyone tried using these. I've tried them on pike flies and they give an awesome action.

They are however difficult to cast on a fly rod.

http://www.wigglefin.com/

they look pretty good to me, i can imagine the wind resistence would make them difficult to chuck out on a fly rod but would be keen to give them a go with a rubber lure.

the americans have all the best lure fishing stuff...just a pity its not always cost effective to get it shipped over