To be honest, while I liked the Muth mirrors overall, I didn't like the lack of a plastic border around the mirror glass, which the OEM mirrors have. And both of my Muth mirrors were misaligned, so I had to remove the glass from the Muth "carriers" and reposition them with new double-sided 3M tape (which is also what Muth uses).
I was thinking about buying Muth's concave signal mirrors, but I hate giving up that much "regular" mirror space.