No idea heh, itd be cool to get one using more powerful magnetic induction to add an extra voltage output wire to power stuff, since thats NOT what the white wire is for
The seller has a very high rating, but the comments look more about price and shipping than longevity of the product.
Its just a coil, basically, that uses your stock magneto to generate power. Basically its just another of what you have, but its a good idea. Maybe this will give better performance than running off the killswitch wire.