Better than expected - start the punching bag even easy to turn, the extremely smooth swirl reacts immediately. Have the Boxsackkette connected to a loop of a butte sport climbing rope with the vortex to similar no metal debris zuhaben - would not have been necessary. Highly Recommended. Have 4 screws (100 mm) and 4 good anchors used and the vortex keeps "bomb-proof"!
