Jeff L wrote a review of Smith Knowledge OTG Turbo Fan Goggle on December 23, 2014
Familiarity: I've put it through the wringer
I have the old 2-battery version that I am nursing along. Much of the foam is gone, there's some duct tape involved. But they work great.
As for the new 1-battery version, not so much. The fan is too weak, underpowered. The only way I get them to work is to stop breathing. I guess if I hadn't used the 2-battery version my expectations would be lower. Returned.