Doesn't work

Works but must be applied every swim or two.

It works well.  You are supposed to spray it on and then wipe it off.  In spite of trying to clean the goggles before putting it on, I scratched my goggles.  Depending on how well you wipe them, it may leave vision slightly impaired (but much better than fogged goggles.)  Some say you need to use it before every practice.  I think that probably depends on if you rinse your goggles after use.  I haven’t had it that long but so I can’t say how long it will last but I’ve gone a couple of practices between reapplying.

I got one and bought another for a swimming friend, we are happy with the product. Our swim session is 1 hour, I'm not sure will it stay longer than that.

Works until water gets to goggles after application. You would have to reapply for it to work during a swim workout.

Doesn't work very well, need to apply multiple times to before each use.