I saw it in the flesh, but I wasn't allowed to test scratch it.
...
Ok, seriously, I don't know how tough the paint is, of course. But it will very much depend on the color how visible scratches will be. As a rule of thumb, I would venture to say that the darker the color, the more prone it is to visible scratches.
That was the reason I ordered sterling silver at first. Since my wife and son found it boring, I switched to Donny Grey, but that's another story.
So I still think sterling silver is the most appropriate color in terms of heat dissipation and resistance to dirt and scratches. And I think lighter colors are in general more forgiving than darker colors.