I've taken my photochromic vapor Mojave shades on three rides, two midday and one evening. They're so lightweight I don't feel them resting on my face and they also stay in place great and don't tap against my helmet on chunky terrain. They didn't fog up when I stopped for water on a hot humid day.
The lens lightened and darkened quickly enough that even when going in a building I STILL didn't notice I had them on. If I do decide to take them off, they fit nicely into my Smith Engage helmet's shades holder.
They have a basic look with no colors which also tends to make them disappear, especially with my colorful helmet.
Planned to use these for dusk rides so I can keep them on after the sun goes down, but I might just run them every ride!