I'd never heard of this and had to look it up.
Now, I'm fully aware I can be a bit of a cynic, but isn't this just a way of selling 'putting on headphones and closing your eyes' as a new, trendy thing to do?
Whilst I can appreciate the idea that it's the aural version of going to the cinema, I just can't see paying money to sit in a dark room (probably not pitch black due to H&S/fire regs etc) and listen to music with loads of other people coughing, whispering and shuffling off for a pee to be particularly enjoyable.
Listening to music in the dark is a hugely immersive experience, and to be encouraged, but I'd rather just do it on my own terms in my own house, as I, and probably many others have, for years.