I finally got around to firing up the Neurosity Crown I bought some years ago to experiment with BCI. Lights are on, but nobody is home; it knows the position of my head, but no actual EEG data is coming into the system.

Multiple attempts to contact any kind of support have gone unanswered, and according to Reddit the founders appear to have quietly disappeared, which pisses me off more than a little bit. This thing was not cheap.