I used PowerGrips as a transition between toe cages and clipless pedals. As for effect and ease/difficulty of use, they fell exactly in between those other two. I found them very easy to get in and out of (except for the issue I had below). The twisting motion is actually very similar to a clipless pedal. And I found that they definitely held my foot in place better than toe cages.
I also like that they don't scrape the ground if you decide to flip the pedal and ride un-hooked. I've actually recommended PowerGrips to some of the DC bike cops I've seen with toe cages on their bikes.
I attached them to regular platform pedals, and the only problem I had was getting them adjusted to the right tension to begin with. I fiddled about with it so much that I actually broke one of the screwsThe folks at PowerGrips were great, though, and sent a another screw right away. Then one of the straps lost its stiffness and began being difficult to "catch" with my toes when I would try to slip into it. It was about that time that I decided to go clipless, but I bet they would have sent me a replacement strap if I'd called and asked for one.



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The folks at PowerGrips were great, though, and sent a another screw right away. Then one of the straps lost its stiffness and began being difficult to "catch" with my toes when I would try to slip into it. It was about that time that I decided to go clipless, but I bet they would have sent me a replacement strap if I'd called and asked for one.

Seems I learned from that moment on to get my landing foot out ahead of stopping. Also learned that moment to angle my heel out first when removing my foot. Duh. I learned quickly. 

