First, I bought the normal radar path sunglasses. I loved them but wanted something more. I live in Seattle which has a constantly changing light dynamic. Both throughout the day and year. With sun, clouds and shadows, these sunglasses quickly adapt. They are not the best in a the car on sunny days. The windshield interferes with the photochromic response but they still do well. But you don't want to be driving a car, right? Aside from the photochromic feature, the radar sunglasses do not block your field of vision and do not slip off your face with sweat. All other sunglasses are inferior.