Not too great.
I have these goggles and they function alright. The lense quality is mediocre and not all together clear as it should be. If the wind blows your breath into the goggle lense, they'll be fogged for a good 3-5 minutes. A good chunk of your peripheral vision will be cut too. Ventilation is not very good. The goggle DOES fit very comfortably and looks pretty sweet when you're riding. Works well with most helmets. Entry level goggles from Anon, you can get a better pair for cheaper right here on Dogfunk.