I have now converted three bikes to Swytch - a Brompton, my big old Dutch bike and my wife's Pashley, and have helped two friends to convert their bikes. It's a bit of a technical job to convert them, and I had to file out the narrower drop-outs on the forks, which is fine for me as a bike fettler - but very much worth it. We live in a hilly area, so we can continue to do the shopping, town and pub rides by bike when fully loaded. I also love zipping around London on my E-Brompton for work meetings. I have had a few minor issues but Customer Service has always been helpful. It would be good if the non-Brompton cranks sensor disc could have a crank-clamp (like the Brompton one), as this is a weak / vulnerable spot which can get knocked. In short the Swytch kits are great - fun to ride and great for keeping cycling and doing load-lugging or hilly journeys without getting the car out. The reason for 4 and not 5 stars is the order time can be quite long and expensive if you pay full price - but much cheaper than buying a new E-bike if you like your old bike!