I've always got a half-dozen or so around the house. I use them for break cues, bar cues, or even fix one up from time to time to give to a deserving kid. I'd rather see him start out with a real wood Canadian Maple stick than some far east POS from Walmart. The joint is strange, but it gives a hit somewhere in between a wood-to-wood and a piloted joint. The long unthreaded portion of pin is just a guide. It doesn't really serve any purpose, and can be cut off. The thread is 1/2-13 into an aluminum female joint in the butt. Dufferin called it their "signature joint". The only j/p's I've ever seen are the ones I made myself.
I think the factory in Ontario closed up shop about 5 years ago, and now the name is used on a line of imported cues. I hope the old ones never go up in value, since I enjoy buying 'em cheap just to tinker with.
Bill