Those soles look really, really thin to me - before you take them on a trip, go find a rocky path, or some other sharp-edged gravel (not smooth, round rocks) and walk around on it for a while. I suspect those soles won't do anything to cushion the beating your feet take.

Don't be bewitched by the 3-ounce weight: in our rush to lighten up, we often forget that 3 ounces of useless gear is worse than a pound of useful gear. (I'm as guilty as anyone of falling into that trap.) I tried water shoes and other UL footgear that didn't actually keep rocks and sticks from pushing up into the bottom of my foot. Now I gladly carry Teva sandals if I'm going to need to wade across streams. Heavy, yes, but they actually do what I need them to do.