Well I sprung for a pair but I got the GUIDE model not the STERN model.
The STERN model let in a bit of light on the outer-bottom corner. The GUIDE model basically closed-off the sides with a better comfortable but snug fit. The GUIDE also comes with a leash(strap)that really neatly snaps into each handle and swivels so not interferring with the way the glasses fit. Too the strap has a sliding adjuster with REVO on both sides a nice touch. The Water Lens(Blue) has 10% light transmission. From what little use I gave them, so far so good.
I was out with the Revo and my Oakley with Black Iridium Polarized lens. I put both on moving each up/down up/down and detail, being able to see into the water was the same. I saw the bedding bass equally well. The Revo Water lens has a slightly different color (as viewing throught the lens) I saw from the Black lens of the Oakley but then still it was slight. It was rather warm 84 and humid I sweat some but the glasses never slipped a bit. They didnt fog-up but it can get hotter more humid so cant say for certain how well they perform in this area.
The styling I think, and my wife too, is great they look slick with the blue reflective coating. This model is one of the VERY few that fit as my wife calls my spongebob squareface.
REVO GUIDE
http://www.revo.com/models/65-sterntm#/models/66-guidetm
Here a pic showing the leash attatchment point and the REVO that you see is the rubber pad that helps hold the glasses to your head better.