I own a pair. You are only supposed to use them during offseason training. It's a tough program and could not get past week 4 of 8 because there was noroom in my gym to do the routine and I didn't want to look weird doing the training on the blacktop. As for me they do help. Before I started I could justbarely touch the bottom of the rim with my fingertips. By the end of week four, I could full on grab rim but still needed a couple more inches of vertical tostuff. Like any program, if you are fully dedicated, you will see results.