I was looking at the various extenders and just bought the cheaper Cue Reach, I think it was $16. It's basically a glorified vacuum extension piece (like Jay Helfert recommended once), and I can't really draw the ball much with it because of the hollowness and probably extended length making an accurate tip placement tough as well. Since I shoot decently enough opposite handed, for the few times here and there I need it it works great, slips on quickly and useful for normal shots requiring a stop shot or normal roll. Played a 3 rail shape shot with it last week with no issues, felt more comfortable than doing the same with the bridge.
Wouldn't mind investing in a more robust extension, but having not seen how well the others fit or experiencing how they felt I figured this cheap alternative would work for now.
Scott