Michael S.wrote a review of Oakley Radarlock XL Straight Sunglasses - Polarized on September 21, 2013
Familiarity: I've put it through the wringer
Oakley sunglasses are expensive but the lens quality is really great. with the radarlock XL's you really get fantastic coverage as well. The straight stem fits very well into my helmet, although I don't know that the regular stems would fit any better or worse.
I switch out the lenses very regularly. Once you figure out how to switch them you can do it in less than a minute.
My only issue is that the lenses do scratch very easily. I never dropped my glasses and one of my lenses managed to get a scratch. I still have no idea where that came from. For what it's worth it seems to be just cosmetic, lens clarity doesn't seem to be affected.