Just installed it. Seems fine, but time will tell the stability, it is all plastic. Hope my expensive S9+ will never fall off. What is not working anymore is wireless charging. I have a thrust wireless charger. Ir dies working with another (thinner) cover.
The overall quality of the product is perfect, installing the phone mount was really easy. 11/10 would buy again.
To make it short. It works perfect and was easy to attach. The quality is really good. I hope it is durable and will stand the weather. The only thing to criticise is the poor quality of the mount tool. Better use your own :-)