I use the Bafang BBSHD and work the heck out of it with no issues. Even if you have a failure of some sort the parts to fix it seem to be the most readily available. Of course that does not mean they are always available. Lot of thing ebike your waiting on the boat. I haven't had any issues but I've collected a few of the common replacement items over time to have on hand just in case. I'm also preparing to take my ebike on tour this summer.