Well, I think that idaho dust is equivalent to Wyoming dust. I have been running mine hard for two years with no issues whatsoever nor do I see any. They are pretty bombproof.
Last year when I stopped in at their shop they had a head in for a refresh that was super used and abused, It definitely wasn't brand new smooth but from the looks of it you would of thought it went through a war. They said after the refresh it would be good as new, I do think there is a small charge for a refresh but I doubt many ever need it.
Itching if you his ever happened they would take care of you unless it looked like you drug it through the dirt and rocks for years.