for HOW MUCH?
the price is stupid, not because it's expensive, but because people, who can spend that much, won't bother to convert their current bike to electric, they'll just pay to get a fancy-ebike (if they haven't already).
by the way, I'm not underestimating the cost involved in this, good quality disk brakes aren't cheap, and the rest of the kit isn't cheap either. But it doesn't change the fact that until the price becomes realistic, e.g. no more than 500 eur, this product will never take off.
But then, pioneer products are usually expensive and undercooked, until the market picks up...