That will be me then.
Doing a bit of testing currently and 5 games in with zero fog. That's a mixture of woodland and CQB sites. Mate used the 2nd set this weekend at UCAP Vendetta and zero fog for the whole game.
To set the scene a little I had sweat running into my eyes at some point and still the glasses were fog free.
For the design I could probably ditch the variable control as I run them at full speed most of the time. They probably could run at low or medium most of the time but because the fans are almost silent I just leave it on full. The whole thing runs off a small USB charger and lasts the whole day.
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it's not really a viable commercial product as it involves a bit of double sided sticky tape and using electrical tape to hold the wires to the legs of the glasses. I've only used it on my glasses and i need to make adjustments for a mates Wiley X frame (actually the legs are wider so I need to make the housing longer to fit over the bump).