On bright bluebird days, HELL YES! They are awesome! I have the Smith Phenoms with a polarized lens and on bright sunny days they are the shit!
However, in flat light conditions, they'll get you killed. In flat light, you can't see the terrain at all.
If you go with polarized goggles, I recommend having a second pair of goggles or getting a goggle with interchangeable lenses so you can have a second, non-polarized lens as well.