When the kit works, it's LOVELY. I had troubles fitting the pedal sensor on my bike, but was never told to measure that section before buying (it's truly crammed into a space that barely fits). I do have some issues with the kit not always connecting property, but it's happens approximately one out of every 15 rides and I just hop off, take the battery off, make sure it's free of debris (which it always is), make sure the cords are all connected (which they always are), and cross my fingers. I love being able to pop the battery off and carry it with me and it's just the right amount of pedal assist!