First, there's no way that this is both safe and effective: if it really does deliver enough current to your brain to make any difference, then it's not likely that these folks have done the kind of trials that would be needed to prove that it's safe. If, however, it doesn't deliver any current to your brain (which is pretty likely, since it's hard to get a signal through the skull) then it may be trivially safe, but it can't deliver any of the claimed benefits. Or, maybe they will try to take the same route as herbal supplements, and make no actual claims while selling you (hopefully) an inert product (but this isn't an herbal product, and won't be able to claim coverage under herbal supplement regulations, which means that both the CPSC and the FDA will probably want to get involved).
The "first hand account" of the effects of the device can't be taken seriously: the author knows that the device is supposed to make them feel good, so we should expect the placebo effect to make them think that they feel better, more alert, whatever. The author is entirely too credulous in any case; this is nothing more than press release journalism, and Thynk is nothing more than silicon snake oil.