I have not, but I am pretty sure they are made by the same Italian companies that make the Black Label suits. I think it might be Corneliani. I'm also pretty sure they are fully canvassed, at least that's what I've heard. So it's a top of the line suit, just with Western styling.
Actually, this thread says Caruso makes RRL suits. But that may be outdated. RL has changed suit makers before. In any case, Caruso or Corneliani can both make top end suits.