Without doubt a bloody useful lure to have.  I've seen wahoo come up on them from total babies (pic to follow shortly) to 35kg, yellowfin tuna, spanish mackerel, giant and bluefin trevally ... they catch most everything and can be trolled pretty fast too if you know what to do with it.  I'm pretty obsessive about billfishing but CD14s are one of the two or three lures I always carry when travelling to pick up fish for the table.