Reich Towing Mirrors

I need new towing mirrors as my old ones are not e-marked and a new car arrives soon. I have always used SMAT weekenders and been very happy with them. It appears that they might damage the car window seal, but in practice they don't seem to.

I have looked at "add ons" strapped to the existing car mirrors in the past, but they don't protrude far enough to give the vision I want, and they always seem to vibrate too much.

However, I recently saw the Reich Mirror and I wondered if anyone has tried it? Any good?

 P.S. The photo is not my current towcar.