Even if this electric supercharger did work, would it really give you any gains? The post about a supercharger taking power to gain it brings up an interesting point. The electric supercharger would drain the electric system, meaning that you have to generate more power to keep it going, which means the alternator will need more power from the belt to generate the electricity it needs to power the system (and you might have to upgrade to a higher output alt, maybe, and to my knowledge the higher output alternators don't produce power via superior parts, but rather by dragging more on the engine...correct me if I'm wrong.) More electrical power means more mechanical power being syphoned away, which means less HP at the wheels.
The mechanical supercharger makes 70 HP, net. Will this electric supercharger make more HP than it costs to power the electrical system with it installed? Inquiring minds want to know.
Turbo/Superchargers (according to wiki, turbocharger actually means turbo supercharger, to which I am baffled) ruin the direct correspondence between pedal depression and acceleration, and completely change the aspects of your ride. Turbo lag being the first and most well known problem. Personally, I want my car to go when I put the hammer down, not 2 seconds later, but to each his own. Of course, if I was saddled with Drive-By-Wire (the trick to make wuss cars peppier than they really are) then the 1-to-1 correspondence is out the window, so go ahead and charge me up.