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Ah, that does suck.
What I will say is with most bike engines/motors/speed controller/battery/switchs and wiring, if they are going to fail its going to be in the first few uses, if any issues arise in that time and then taken care of you usually aren't going to get any more show stoppers (BB wear/pulley output bearing and reduction drive and/or one way bearing wear or failure happens over time)
Hmm, interesting. The guy in the shop said he'd tested it, did about 20km (I reckon he rode it home then back in the morning) & had no prob. He took the cover off the side of the motor, all cables looked OK. Tried different battery, no change. Ran Bosch prog which said the motor couldn't be seen. Very disappointing