My personal opinion is you are being overly sensitive. If you are after perfection, don't buy a dodgy, half-carbon fiber, non-genuine mirror cap of a site more spurious than ebay. Especially one which is so cheap. There used to be an expression that you get what you pay for.
I didn't go the M-style with the wing, as I thought it would look dicky from the driver's seat. I cant comment on the whistling.
As for the scratches, here is a walk around I just took, and tried to highlight the scratch.
The mirror is fine
Flash
OFF
Flash
ON
A shot of the scratch. With the lighting in the garage, its hard to notice it. It is a tiny white line. Tiny.
I don't get close enough to my car to notice it. If you do find yourself getting close enough to notice it, please wear a condom.
