Like Graymatter, I too would like to know if there are any negative affects from manipulating brain waves. Without considering the organic changes and only the visible effects, Bill Harris doesn't appear to have suffered any ill effects, at least on the surface. Anyone who uses this techonology is, if effect, a guinea pig - including myself.
If you have the cash and inclination, at least try it. If you don't then... don't. The sky won't fall in either way.
