Overall I like the Swytch system. It is not that easy to install as the front axle is just marginally larger than some dropouts and the Go battery is huge and very heavy. I could not fit this in my wife's walkthrough bike. The Air that I have on my bike had to be swopped with the Go to enable a battery fitment on both bikes. It is however much more inexpensive than a new bike and lighter overall. And the operation is simple and effective and kicks out descent power. For shopping and commuting it is ideal and eases laden bikes full of groceries! An option to buy a standard rear dynohub would be a good idea since this could be built around any bike and the weight would be more evenly distributed. Delivery on both orders was delayed.