I’m surprised no one’s replied earlier to this thread and question. If anyone followed my story last year re bafang motor failure issue and warranty not supported by an ebike shop in Sydney (unnamed after a settlement ) I took to court and won on appeal and was compensated for, update, I subsequently replaced it with a m620 motor from Wattwagons with the Archon X1 controller. I can tell you it’s like day and night the difference between a stock bafang ultra motor and the X1 controller tuned ultra motor. I’ve been blown away by its power, smoothness and efficiency on battery life. I feel like its the experience I’ve been waiting 5 years for and multiple failed bikes, including the absolutely useless Kalkhoff bike I started with then going through numerous 1000W bafang motors to the failed ultra motor, god I’m pray I don’t jinx this one, but so far so good, I’ve also replaced the alphine 5 speed rear hub to the the 11 speed, if it handles it (time will tell), it’s a great combo, the X1 motor cost a truck load especially in $AUS dollars and shipping fitting etc but so far so worth it. For anyone thinking if it’s worth it, it is.