Something about DIY brain-zapping seems just a trifle ill-advised. Given the differences in shape of faces and skulls, does the Einstein wanna-be have any notion in exactly which areas of the brain those currents are going to flow? A mm or two here or there for the maximum current density, what difference does... oh. Yes.
I gather that there can be real effects from brain zapping with low currents, so perhaps it isn't entirely fair to compare Thync to orgone. But do-it-yourself?
If it makes a difference, flee. If it doesn't, try a peppermint. It probably won't help, but it'll be more fun.