It's Oakley or nothing
Pros: I now have 4 lenses for the A-Frames that I alternate between my and my wife's goggles (Black Iridium, Pink Iridium, High Intensity Yellow and High Intensity Amber Polarized). Each of them have benefits in different weather conditions. The optics in Oakley lenses are second to none and they never fog up and fit my helmet perfectly. If you are able to pick up replacement lenses at a discount like Sierra has right now, you are getting a great lens at a terrific price!
Cons: While they can be a bit pricey, they are still worth it.