Will this ever catch on, is it being used? I went to a talk at the IoP several years ago and although the technology looked good, so much depends on it being i

Will this ever catch on, is it being used? I went to a talk at the IoP several years ago and although the technology looked good, so much depends on it being implemented. Thinking about it I imagine it would probably work best in a room with a high ceiling, as a vantage point. So other people wouldn’t obstruct.