I have them on MKS GR-9's. They're great. Powergrips and smooth pedals let you wear street shoes on your bike but still have good control.

I wear size 11 or 12 shoes. Needless to say, on narrow pedals like GR-9's, my feet try to roll outwards. Clips and straps provide better support on the outside, but they trash the shoe tops. Powergrips are nicer to shoes, although they require a bit more effort to keep the feet level with the power going to the center of the pedal. Powergrips make the right trade offs for trips up to 5 miles. I haven't tried them on long rides yet.