I've got a set, they're fine. Nothing spectacular, but they are no more or less crappy than they look in the pictures. The mirror housing is metal (aluminum?) and the clamp is a cumby white metal that does the business it needs to. Mine have a habit of coming a little loose and moving around, but I dont yarn them down too tightly. Look nice on the bike. I liked them well enough to buy a second set after a drop tested the bike and busted the left one up.
Please dear god dont accidentally order a carbon fiber appliqué set. They are all over ebay.