I am very happy with my original kit that has transformed my mountain bike. The up front payment and slightly delayed delivery was a bit disconcerting but once fitted the kit has been fantastic! Having had both hips replaced and uncomfortable with getting out of the saddle to power up hills the assistance from the Swytch kit made my bike a pleasure to ride again. Another bonus I have not heard mentioned is that when I cycle along muddy surfaces , canal tracks etc I have 2 wheel drive !!! My only suggestion for the future would be to have outlets where the kits are available to view as all the variations available now are slightly confusing and it would be nice to know a guaranteed delivery date.