Pros: Relatively cheap and relatively simple way of making your favourite bike and E bike. Customer service and purchasing generally good once an order is placed. Kit works exactly as stated: range weight etc Someone who enjoys tinkering can fit the kits pretty easily Cons: Order process is weird: like buying gig tickets. Why can't you just say "out of stock. We can email you when new stock is available"? Not enough power to get you up proper hills. On a long incline the extra power flies you along. Hit a proper hill and you have to get off and push. Which brings me to ... Batteries are heavy. To do a proper trip with mates you need 3 air max. Which should give you up to 45 miles. They're heavy. Pushing the bike up hills is like wheeling a wheelbarrow of bricks. Especially when you add the Go++ on. Batteries are very very expensive. Like "new bike from Halfords" expensive