As carbon says, the CM reps are cheap enough to not be overly worried if one gets a bit bent by a pothole. They don’t seem to fare any worse than OEM wheels from what I’ve read.
As for road legal, I’m not sure what the regulations are but CM Wheels sell enough of the things!
The sole reason I bought a set was the state of the roads this past winter and me not wanting to risk an expensive set of OEM wheels.