I bought this product intending to improve the blind spots on the mirrors of my 06 Rav 4. The spot mirror looks too large for the original car mirror, that is covering too much of the original mirror. It might be a better product for a large truck mirror. Then I read about adjusting the car mirrors correctly to cover the blind spots, an article published in the AAA magazine. Then I went to a shopping center and parked my car parallel to another car, one lane over, at a distance that would be dangerous if I cut over without seeing the other car. It worked perfectly. My car has a large blind spot area, my old Nissan Sentra and other cars I owned were not as bad. So it made this product not very useful for me.