I use this mount with both my Go-Pro Black and my I-Phone X. It is very sturdy. I have a Harley Davidson and so far vibration is not an issue. I looked around for quite a while to find a mount that I could trust to hold my expensive tech. I use it with a pro clip iPhone holder that grips the device and uses a lever to lock it down tight.

quick round bar mount, works great on handle bars and holds camera steay

Used this for mounting a baby monitor on the side rail of a co-sleeper crib. Works fine for that. Not sure how well it'd withstand bouncing around on a mountain bike, though (the clamp doesn't seem particularly grippy). My one gripe is that I got charged $7 more buying it in the store than I would have had I bought it online and then picked it up at the store. Didn't realize this until I'd gotten it home and opened the package. Super lame on Best Buy's part to not acknowledge the different prices on their website. Won't walk into their store and just buy something ever again.

I am using this mount with a Samsung 360 camera and it works great. It's hard to find a universal mount to integrate with go pro mounts but found this for standard applications. Worked well and did it's job.

Did not use for handlebar mount. Attached to a "round" rail. Needed a longer bolt to attach to larger diameter tubing. While metric threads, easy to find at hardware store.