Originally Posted by
2old
The individuals I've known who have bikes with Bosch motors haven't had problems, and Bosch has a US office to resolve anything that might occur. I prefer Bafang because they're modular and parts are accessible (although I've never had a problem with any of the three units I've built). Yamaha has also provided good systems for all that I've encountered, but IMO Bosch is superior.
I can attest to that, in 10 years we have replaced 2 motors only and we sold a ton of Bosch equipped bikes. My only issue has been a slight overload when I am using my high beams and horn it doesn't like that but I also have an upgraded taillight so I know what is causing it and not really a Bosch problem and I think they solved that sort of thing with the new gen Smart motors.
When you have a company coming straight out of automotive and consumer products you are likely to have decent support long term which is what I appreciate. They know that automotive stuff needs 11-16 years of support and they extend that to their bikes as well.