I'm really impressed with the kit. I'm really happy with it and the quality is really good. Installation was quite straightforward and I made sure I had enough time to complete it without having to rush. That last bit sounds obvious, but don't give yourself half an hour as it'll go wrong! Have really enjoyed using it and it's very simple to use. The press of a button to give a boost as and when needed has really helped me enjoy biking even more. It's great when towing the kids in the trailer too!! A couple of bad points....the ordering and waiting for delivery was extremely annoying. it got delayed several times and ended up being delayed by 3 months. Customer service did let me know about delays, but were very vague about anything beyond that. I ordered the brake sensors and unfortunately they aren't compatible with my brake levers. After contacting customer services with pictures, they issued a refund immediately. Whilst that's great, I'd have preferred a solution - or an attempt at a solution - as opposed to "Oh sorry, here's a refund.". The wheel itself is quite heavy compared to the original bike wheel. Not a huge problem - and very understandable! - but something to be aware of. The price is now quite expensive, especially with what is now available on the market, however its ease of installation and the fact you can keep your own bike, just about justify the price. For what I've used it for so far (road biking, field/woodland riding) it's been excellent.