I was a little skeptical of these at first but I got a pair over the weekend. Putting them on in the store they were very comfy.. made a couple of practice swings and they seemed to hold up pretty well. All the straps on them make it so your foot doesn't move around.
Played 18 yesterday and I have to say that, for the most part, I honestly forgot that I didn't have my regular golf shoes on. No slipping, no moving around, no nothing. Obviously when I was in the bunker I managed to get sand in them... but to my surprise by the time I tee'd off on the next hole they were clear again.
I don't think I'd ever try and WALK 18 with them on... but overall I definitely give them an A+. For summer time they're great to beat the heat!