Quality is really good. I've used it to mount my Hero 9 and working fine as designed. Mount has a very small footprint when mounted in the helmet, but it feels very sturdy.
Delivery took a while from when it was purchased. Showed it was sent out and given a tracking number about 7 days from purchase date and needed a couple more for delivery. Support doesn't answer email though when I inquired about it. All in all, it was good and will purchase again if I have a new helmet!