I've had a version of these goggles for at least 3-4 years just because I like how they fit my face, and I know they really work. I've used them (with 2-3 different lenses) in all conditions and temperatures at resorts and in the backcountry, and they work great! I've hardly ever had problems with fogging, and yet they are very warm. The dark lenses block out a ton of light. The low-light lenses highlight the snow incredibly and can be kind of a secret weapon or game-changer in dim/stormy conditions... I feel like I can depend on the reliability of this goggle. You just have to be careful when changing lenses!