Thanks for the link Greg!
So I tried this out yesterday at my gym’s pool, where people just stared at thought i had some type of disease :-)
The visibility is insane, and never once had a problem fogging, during the hour i stayed in the pool playing around.
The float valve concept design doesn’t let any water into the mask and is brilliant. However, i was curious what would happened in free diving, and went fully submerged to the bottom of the pool. It worked fine, but its just something i wasn’t used to, coming back up for air and not having to blow out the water, you can simply start breathing again. But i dont think this would work at great depths, the pressure you feel on your face is a lot greater than a regular mask; i was going to about 5 feet and it worked but i dont think with the pressure on your face you can go much deeper than that.
Anyways, so far i love this thing, i wont be using it for free diving but for general snorkeling with my girlfriend. The amazon seller also has a small-medium so i just ordered one for her as well.
Cheers