Double-Diamonds are fine and I can see them being useful. There's a definite difference between a trail like Cliffs vs FIS or Black Diamond at ME. And a big difference between trails like CR Run, Cotillion, and Middle Earth vs Liftline and Rumble on CR peak. I think the double-diamonds make sense to at least give some guidance to new people. I may not agree with each individual trail rating (i.e. Ripcord is really a questionable double unless it is a sheet of ice).I like this idea.. neither Alta nor Squaw has the double diamonds,.. and those ski places run just fine.