I have built alot of my own jigs using the standard collars and skirts but was considering getting some of the cone type collars. Have any of you jig builders used them and do you like them or not? Looking for some opinions likes dislikes etc...

                                           

I was reading about these in field and stream.  I haven't heard anything directly about them, but they look like they would add a wiggle to your worm!  I was thinking about getting some myself.