My employer and university have had these on conference/lefture rooms for years. They're ridiculously expensive from what I remember (700€ for the ones at work,

My employer and university have had these on conference/lefture rooms for years. They're ridiculously expensive from what I remember (700€ for the ones at work, I think, the uni ones are larger and older, so probably even more expensive), but compared with not getting the information as easily as they provide it makes them worth it.