I tried one on, but didn't bother to dive it.
It's heavy...
I believe these go together... It is a bit heavy on land, but when diving, it is not... A scuba tank is rather heavy on land too... But when I dive with them, they don't seem that bad!
The air in the mask will give it enough lift that it does not seem heavy in the water at all. We did the first demo dive with them, about 25 people diving them in Cozumel, and the response was overwhelmingly positive.
Maybe not for everyone - but it is one of the coolest new gadgets out there, and more than just cool... it's very functional especially for photographers who want to leave their hands free. And the ability to have all your data right there when making ascents, night dives, etc is amazing.
Again, the price may put it out of reach for some, but a Lexus is out of reach for some... that doesn't mean it's a bad car.