LA purchased a few BYD e-Buses a few years ago and BYD is still trying to make a bus with a lifespan longer than about 1 month. While L.A. is trying to make the purchase work, most of their other U.S. transportation agency clients have simply demanded refunds.
BYD succeeds in places where quality and safety doesn't matter. It's why they've taken off in Asia but have made minimal inroads in countries with strong automobile safety regulations.
Albuquerque had a contract with BYD for buses. The first one arrived late and had tons of problems - the range was 1/3 less than contracted, there were broken welds, leaking axles, malfunctioning doors and wheelchair lifts, and brake problems. The second bus wasn't much better. They eventually canceled the contract and bought diesel buses from New Flyer, which was a step backwards, as most (if not all) of our other buses run on natural gas.
The most frustrating part was that these were for a new dedicated bus lane which required the passenger door on the opposite side of the bus, so the city couldn't just use buses they already had in the meanwhile. Instead the lane went unused for nearly two years after it was built, in which we lost a lane of car traffic but were still having to share the remaining lanes with buses.
My city in Sweden use BYD buses (I think they're pretty much the only option?). My impression is that they've worked pretty well, with more cities buying into them.