I have the mirror with me in the garage in use, because I wanted to go by car fairly close to the wall of the passenger side. This works quite well now and secure with the 90 degree panoramic mirror. The attachment on the two existing holes was a breeze and took less than 15 minutes.
I can write nothing about the long-term use. On the positive side but still worth mentioning that the seller shipped very quickly and has securely packaged.