I have a pair, and I can't stand them. The power grips have all the faults of toe clips, and none of the advantages. With toe clips you can adjust on the fly to adapt to different shoes, they are easy to get into, can be run loose or cinched down tight for grip. With Power Grips, you have to readjust with each pair of shoes, the tension is determined by the angle of your feet and they rub even worse than toe clips.