I began to get worried when promised delivery dates came and went but once the kit arrived it fitted easily and I am delighted with it's performance. Full disclosure: I'm a life long cyclist living in Spain who's nearer 80 than 70 and have been using the kit outside of it's intended use. As It's been a few years since I've wanted to climb some of the mountain passes here I use the assist to help on the very steep parts and ride the rest myself. Turning around at the summit I can descend easily even with a spent battery. With a little forethought 40Km rides in the high mountains are now possible again. If there was an easy way to carry a second battery or Swytch offered a way to extend the range I would be placing an order. Downsides: My initial build had the battery as high as possible but I found that it adversely affected the handling, particularly in high winds, a ten minute fix. Very slow and tight turns need my full attention as the motor can "assist" with just a little pedal pressure causing a wider turning circle than expected. I've swapped bikes with a few riding buddies and they've all been "converted".