Had noooooo clue such a thing existed, but yes, it is indeed expensive. I'd be tempted to try one that's cheaper than 700€ (money back if not satisfied or not), as someone earlier in the thread mentioned one: but how do we know how efficient those other devices are compared to the Nurosym (which seems the state of the art device atm).
Has ANYONE on here had improvement with brain fog ? I've read about improvement on mood, feeling calmer (sympathetic NS and inflammation reduced), ppl mentioned sleep... that sort of thing... but anyone actually improved their brain fog with this thing ? Thx.