I used to like my Power Grips, too. Still, the strap was always on the underside of the pedal and there was always the chance of snagging something before I got the right foot into the grips.
You ride clipless for a couple of weeks and try the platform side for a day. When you take off from a standing start, you will know whether you were gaining anything on the up stroke.
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Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.