I found them the coldest and worst gloves I ever owned. Only gloves I've thrown away before they wore out. As a winter glove I thought they were pretty dangerous really.
They are 100% waterproof in terms of letting water out, they do let in a load of cold water through the cuffs even if you tighten them up, and this makes your hands freezing. They also don't let out sweat, so if you're riding hard even in the dry you end up with frozen sweat all around your hands. The moment you stop, all this wetness cools down and you lose all feeling in your fingers.
They are also bit too tight on the fingers to comfortably wear liner gloves under, so you can't even make them work that way.
Joe