I found the kit very easy to fit, I took my time and followed the instruction leaflet and found the second bike so much quicker to complete in less than an hour. To fulfil the guarantee took a while with photo’s at each stage but necessary clearly. The video of the motor in action needed a second person to complete easily. All charged up, first ride out was perfect. Been used quite a few times now and just love it. I can scale a nearby hill which is at the start of any of my rides with such ease. Love this, my wife is certainly needing it, and is very impressed.