I bought these as a replacement to my I/OXs and prefer them hands down to the I/OXs.
I bought the all black model with the dark black lens and it came with a persimmon lens. Lens clarity on both is great for a non-polarized lens. It is a spherical lens, so the field of vision amazing. Large frame + a spherical lens makes for a great goggle for someone with a large head.
My only complaint with these is the ventilation. They have never once fogged on me, and I have had them in any condition possible; from sub zero, to rainy 40s and everything between but, the complaint is, when you get any wind at all, your eyes will freeze and dry out instantly. There is too much ventilation.
As for weight, they are not as light as the I/OX but goggles are light to begin with.
Durability: I have only acquired on scuff on them through normal skiing. When I take them off I put them in their soft case and inside my helmet which never goes in my gear bag. So, I havent truly put them through the ringer for durability.