hard to rate.... Haven't had a chance to run in these shoes yet - They are impressive to look at, and it would seem that the sole will handle all the scree I hit on my run/climbs, so I'm happy with that.  Just wanted to point out that there are TWO different versions, and the Amazon description for the ones I bought showed them as the ClimaShield version, which is actually a separate shoe (look for CS at the end of the name).  Not that big of a deal, but I talked myself into them b/c I thought they would double as Winter/snow running shoes.  However, the outer may be pretty effective in drier Colorado snow, but not the wet stuff.  Just be aware, if you want the wet protection, look for the same shoe with "CS".... will post after my first serious trail run, but so far I think they will challenge me to try harder terrain.  likely to move up to 5 star, but cant promise till I do a hard couple thousand feet long trail run in them.... *BUT* I think they will take more than I'm able to give.