I already had an ebike for two years but found it pretty heavy at about 60 lbs. so wanted to see if this system was better. At one third of the cost and putting it on my lightweight urban bike I am now going to sell my first ebike. Positives: the assembly was pretty straightforward and it all worked right away. The sensor is very sensitive. I was concerned that maybe I should have gone with the throttle like on my other ebike but I don't need it. The combination of light weight and sensitivity works great. It is very fast and powerful. Negatives: installing the front wheel was tricky. It was a very tight fit. The sensor parts seem very flimsy. I am concerned about how long that unit will last. My next concern is about theft. Having just had another bike stolen I am worried about how easy it would be to steal the battery. I know I can open the three velcro straps and unplug it, but if I am just in a shop for five minutes I don't think I would do that. I have added black masking tape as a deterrent. The electrical wiring was long so I ended up with loops which does not look that elegant. These negatives are all pretty minor. Overall I am extremely pleased with the assembly and how it all works. So much so that I choose it over my existing ebike. All the usual positives apply as with any other ebike: I ride a bike more, use a car less. It flattens out hills and makes riding a bike so much fun.