With my electric bike kit, I was not expecting it to be this powerful for a 250w motor and such a small battery - what a joy to ride! It's so powerful for the specs, and so far I think it can go further than advertised on a charge. I live in a mountainous/hilly area, and the motor can assist me up to 32kph/20mph still! This ebike is so powerful for the price. I really appreciate the build quality - mostly metal parts, great connectors, and strong metal screws. While I have only used mid-drive ebikes before, these kits seem on-par or better in terms of power and build quality. In addition, I later ordered the throttle and brake sensor; great upgrades for starting off and safer braking (the motor take about one second to fully stop assisting on levels 4/5 and 5/5). I've even already recommended it to a few friends, and they seem like they're also going to order it! I'm currently planning for this to be my "nice weather" ride to and from work, school, home, etc. as the Air battery has plenty of range (advertised ~9 miles on level 2, but proving to be even better).