No perceptible anti-fog effect.
I bought this by mistake, thinking it was a name brand that had worked very well in the past.  This product had no perceptible anti-fog effect.  In addition, the instructions say that you need to spray it on your glasses and wait for it to air-dry before wiping it with the supplied cloth, which is not too convenient when you need to get going.  But that would really be important only if the product worked, which it doesn't.  Just a waste of money, in my opinion.
Rating: 1 stars