Is there any utiility in the brainwave measuring biofeedback devices and etc as written about here ?

http://singularityhub.com/2014/11/14/exponential-medicine-braingear-moves-beyond-electrode-swim-caps/

Isn't it like having a device that tells you when you're hungry or not - ie, a bit superfluous ?

Also, when it comes to those mind games where you wear a headset and use mental focus to push a ball - are y'all shit hot at that ?