My alpha crux with a pin above the bridge, and 4000 grit finish makes as hard a back end move while retaining energy as any ball I have every thrown. It gets down the lane better than a Lock with the same surface prep and is way stronger on the back. It gets down the lane similar to my Paradox, also with similar surface prep, but is again stronger on the back end. Very unique for a ball with such a heavy roll characteristic.