I came across a guy in Syracuse who had a Bionx kit. He was pretty upset that he was on his third battery in only a few years and it was difficult finding a place to replace them. I want to say it was several hundred dollars (7-900?) to replace the battery. My Ping was much less than that, is much lighter, will last much longer, and provides more volts and higher amp-hours (faster and longer-lived). Plus, if I upgrade my motor, the battery can still be used. This was really the nail in the coffin for Bionx, for me. I certainly understand the appeal of it, though. As far as quality of motor and battery- not an issue. I've ridden across a field of deep snow because it was the shorter route this winter, up and down Finger Lakes hills, through deep puddles, rainstorms, snowstorms, REALLY cold weather... I'm really happy with Ping and Amped. I know there are other builds that have more torque, faster, just as reliable, etc, so I'm just adding an opinion on what I've got!