Whoa. A good thing to know. Thanks.
This tDCS is for real. It's not going to cure AIDS or fill potholes but results have been reproduced. Right now the field is wide open -and all over the place. The (business) students at GoFlow are not be best example of the approach but are an indication of how much interest is out there. As I understand it, they started out as/still are a student project. Again, a project of a group of business students. "Snake oil" seems entirely fair.
I really only mentioned them in particular since they've made the news a lot lately and had just released a full schematic. I was double checking their notations and looking for part sources when Google turned up this thread. (I don't know much but their 'schematic' in the Make post about them was pretty stupid.)