I have Power Grips on a set of pedals that I sometimes install on my Brompton (though at the moment they're installed on the monstrousbike which isn't doing very many miles at all).
To tell the truth, I've been using SPDs for too long probably to really get comfortable persevere with Power Grips. When they're adjusted just-so they'll cinch up as tightly as though you were clipped in. When you ride on the other side of the pedal, they might scrape on the ground but you can think nothing of it, unless they happen to catch on something. The tricky thing is if you ride in different shoes a lot, because Power Grips are really set-and-forget and are best set for a given shoe chunkiness. My knees are very picky about foot angle, and I found PGs to require a bit too much inward force to stay nicely tensioned; that's probably why I don't use them more often. Your mileage may well vary.
At the moment I actually swap my SPDs for MTB/downhilling flats when I want to ride my town bike in 'normal' shoes, but the spikes on the pedals are so big that I have more float with my SPDs! I'm (still) thinking of buying a pair of combination SPD-flat pedals for my town bike: SPD for biking and flat for the occasional jaunt in jeans and walking shoes. The Deore XT T780 pedal looks nice and wide but is apparently slippy in the wet; the M324 is cleaty but narrow; the M424 and M647 are huge and heavy; the A530 looks better in black than silver, and the M545 might be the pick of the bunch.
Laid Back has a pair of Power Grips on the stoker pedals on the mighty Quetzal tandem, so might be worth a try out just to see how they feel.
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