I have the Smith IO/X with Photocromic. If I place them on my helmet, then onto my eyes it takes about 10 seconds for them to come around in regards to recognizing the light. IDK what kind of riding you're doing, if you're going into caverns then coming back out into the sun consistently, but in simply riding down the hill ALL DAY without having to change your lenses, they're pretty f'n sweet. Anything that means I don't have to touch my lenses or even have them factor into my day in anyway is excellent. I'd rather focus on other things and this goggle let me do that. Never really fog up even with my face mask close. Would reccommend.