I'm happy about how good is the kit, I ride my bike more often than before, leaving my car parked, and the kit is quite easy to mount, I did it myself. however, there are some cons: 1) I feel more drag as expected, about 20% of my power goes to win the drag when the engine's power is off. Feels awful to ride when the battery is down. 2) The battery range is also lower than expected, with the correct setting and use with level 1. I reach about 9 km with the small kit and 21km with the big one 3) the second kit came with the wrong wheel size, very slow, and disappointing customer care support