Took advantage of ordering in advance with discount, delivery was 6-8 weeks longer than hoped but after 9-months was almost academic. Go Kit appears well made aside from excess wiring as commented by others - had to use 10 cable ties which incidentally weren’t included in kit as indicated. Installation was reasonably straightforward, (I’m not a bike mechanic), only issue was I chose integrated sensor which required crank removal tool which I didn’t possess so had unexpected trip to local bike shop which cost me £10. Don’t remember this being mentioned when ordering but that was long time ago! Only had couple rides and power boost is really useful - can’t comment on range yet but hoping this will be beneficial for a 62-yr old!