I've had them on our last 5 vehicles and swear by them. In response to Kuato--I like to have my mirrors adjusted so I can see just a slight edge of my vehicle because it gives me a point of reference. The 2006 Ranger extended-cab I have has the factory flag mirrors, and there's a blind spot when cars are on my left and up to the rear edge of my door--can't see them at all and have been surprised a few times (only vehicle that I've ever had that was like this). Without them on my Ranger, I can't see the rear wheels or what's around them, but with the stick-on round mirrors, can see all. As earlyre mentioned, my sister-in-law has the panoramic inside rearview mirror--think it helps her a lot, because she's such a terrible driver.