Does anyone own neurofeedback equipment?

There are some relatively cheap consumer units out there now I understand. I haven't even looked in a while, the Muse is one that comes to mind but I remember there being other lesser known options with more channels and maybe app driven?

BTW my interest is to measure meditation state, to see if I can actually track my brain state to stop at a natural point when I've successfully shifted into a different state, rather than an arbitrary amount of time that sounds good.