I hate being locked-in to a manufacturer and not being able to source the part myself. With these motor systems we can't just replace it if it breaks. Imagine not being able to replace a chainring and having to total a bike. That's where we are with these motor systems. So with repairability in mind, which system can I actually source my own replacement motor? I know the new Bafang M820 I can buy myself and it looks pretty good.