I seldom use shades for driving, given the windshield tint. But in the instances that I do, i2i works for me (palibhasa can't afford Oakleys eh :bwahaha
i wear glasses, so i can't buy those really nice raybans, oakleys etc.
didn't want to wear clip ons kaya i got a separate frame (brown colored), regular lens na may grade, had it tinted dark brown, and wear it exclusively when i'm driving.