I use power grips too. Mostly I use my (non-cycling specific) Merrells. The signature Merrell sole seem to work really well for gripping bike pedals, and I think being a sneaker-boot hybrid they tend to have a stiffer sole then just regular sneakers. I've been using mine for about a year, and there's no signs of them falling apart.
Also, I got a pair of free Chrome shoes a while back when they were doing a promotion... they're Ok. Some people claim they're not comfortable to walk in, I think they're fine to walk around in all day. Certainly not the most comfortable shoe to walk in, but not unbearable or anything. For cycling they work alright, much nicer then biking in a regular sneaker. I think I've had them for about 5 months, and there's some stitching coming undone already. I also wish the sole was a little more grippy. My personal opinion on Chrome shoes is that for free they're totally worth it, but no way I spend $70+ on them.