I haven’t used this exact version but my wife and I have rotate pins on our backpack when we go to Disneyland. After having a couple fall off or get removed, we got a pack of this style in the park and I’d highly recommend them. Super easy to pop on and we haven’t lost a single pin since then, like three years ago.

Not yet (I want to find a pack with a more sane quantity before ordering) but I’ve used plenty of things that are held in place with set screws over the years as an avid tinkerer and I can almost guarantee this will be much more secure than a butterfly clip

I’ve used a ton of these, they work great