My saga with mirrors continues:
A friend gave me a single Rizoma Retro mirror recently and in the search for a matching mate, I found a set of similar mirrors on Amazon.com. I figured a genuine Rizoma is $125, and these were only $29 shipped, so if these are junk I'll just sell them.
I just received the mirrors from China.
I will post a full review once I have installed them. For now here is a quick comparison.
Out of the box, one can tell right away the Chinese mirrors are cheaper. They weigh less, and the quality of the casting is much rougher. The genuine Rizoma is on the left, and the knock-off is on the right (with the blue expansion bolt). The knock-off has a pebble finish, and a few rough spots under close inspection. As well the allen screw holding the mirror is smaller, with a gap in the hole vs the genuine article's tight fitting screw.
The mirror stem on the Rizoma is also thicker compared to the knock-off. Plus on the knock-off you can clearly see a nylon bushing surrounding the ball end. The knock-off mirror is very easy to pivot, which might result in a mirror that doesn't stay in one place when adjusted. But we'll see once I get it on the road. A look at the blue anodizing also shows how thin the coating is.. it's already showing signs of wear.
When I get some time I will do a full review of this set of mirrors compared to my CRG blindspot mirrors and the other set identical to the OP's.