I've owned Oakley, Smith, and Ray Ban and the optical quality of Kaenon is far beyond any of them. I tend to get headaches from even the slightest distortion, and have had no problem with Kaenons.
The Rhinos are a little bulky, but that makes them nearly indestructible. I grab them first for skiing, snowmobiling, and dirt riding. They seem to be very scratch resistant, too.
You get what you pay for. The Kaenons are not cheap, but neither is $1000 worth of sunglasses that sit at home because they simply don't work for me.