I have both the current generation and the last generation, which I liked better.
The new ones pull air from the outside thru the fan into the goggles. Get into some powder and you end up pulling snow into the goggle, defeating the purpose. Quality and foam are better, though.
The older style goggle had a sealed fan, so when the fan was on it recirculated air, kind of creating a higher air pressure inside the goggle, which help clear the lens and kept snow out of the goggle. The foam sucks and they're probably hard to find now. ProVue might have a few (I bought 3 pars last year for $50 each).