I have run them up to ~85 so far. My suspension is fairly stiff and they are very steady. Because the outer housings are so light though (main housing is 3.6 oz), they are subject to some crosswind vibration and heavy shock from potholes etc. Although minimal. I have some silicone bumpers I can install in the lower pedestal to stabilize them while in the standard "locked" position.
As for the tint, I'm glad you told me... I will get them as close as I can to that tint... I have seen a few different parts Downforce has made tinted and it looks ~50% smoked.
Here is some matte clear I shot at about 70% (on the left)