Yes, I have M510 4.0 version. Not impressed, motor is very noisy compared to the 3.0 version, and unlike 3.0 it is very difficult to use unsupported - yes I know it’s a e-bike, but when I would hit the 25kph limit with 3.0 the bike could still be peddled ok, with 4.0 when over 25kph, it’s like...