I'm not sure how or when I'll use this. I got it mainly for an Insta360 camera, where I mostly want to capture moving 360 videos with an invisible selfie-stick. If I use this on a vertical surface, one lens doesn't see much, so 360 videos are out. Still useful for other videos and can be used with other action cameras, provided they are small.I may try it for a couple of quick shots on the roof or bonnet of a car if I can convince myself that it's safe to use. Grip seems strong when I tried it indoors just now (see video), but with several hundred pounds of camera at risk, I may need to figure out a lanyard safety backup.None of that is a criticism of this specific magnetic mount, which is well-made and works. The main parts are plastic, but of the thick and rigid variety. It's all well-finished with nothing that smacks of cheap and nasty.The hinge between the two parts is well-judged (stiff enough to hold a camera without moving, but not so stiff that it's difficult to move). I will need to see if that hinge stays like that with use, as there's no way to adjust if it becomes loose (as another reviewer has pointed out).