Mine aren't bars like that. But I have the aluminum cleats from Simms, which are fairly flat and wide compared to regular studs. I would think some of the same would apply.
Great on broken surfaces. Dirt, mud, even river rock type surfaces. They are like ice skates on big, flat rock. I've been debating taking them off, but I haven't done it yet. I think you just have to adjust your thinking a bit. When I see a big, flat, dry rock to walk on, I usually get more confident in walking, as such places are typically where footing is best. And perhaps you get a bit careless. But with these, those are the spots where you have to pay extra attention. Just an adjustment.