Seconding what Ewn says, a good pair of polarizing sunnies are much more useful and can be used in and out of the car.
Maui Jims get my vote, they have some of the best lenses / tints available and most can also be made up to your spec prescription as well. A very important accessory to protect drivers of open cars from too much UV.
No connection to the suppliers, just a very happy user and retired optician.
