Only a bunch of opinions. The real down side is that if the power went out or if the electro-servo mechanism failed the amount of effort needed to stop the bike changed. This left people thinking that they had no brakes. Actually, most had the same braking ability, they just needed a hell of a lot more squeezing on the brake lever to get it. Worst case was intermittent problems. I am only aware of one case of that.do you have more info or article on this ?