Metolius Ultralight Curve Nut: Solid to Place, Stubborn to Clean

After four months of use, the wires still look new, and the heads have the minor dings and dents expected of gear that's been used.
Though I'll break out the Ultralight Curves for climbing hard, single-pitch trad routes—where I can just clean the pesky placements on rappel—I prefer other nuts because of ease of use. That said, the Ultralight Curves are the most confidence inspiring passive gear on my rack.