They are used in niche applications. All in a somewhat similar way, in my opinion: precision technical work. Where you need free movement of your head but als

They are used in niche applications. All in a somewhat similar way, in my opinion: precision technical work. Where you need free movement of your head but also need urgent real-time updates, or a diagram or secondary view, of what you're working on. Fighter pilots, surgeons, underwater divers working on complex machinery. I've always figured they will stay largely restricted to those niches. But cost coming down might see new applications.