Customer service was excellent. The switch kit is actually easier to fit than you might think. Once you order it you are notified every step of the way - it is very clear and upfront. Any problems they really do help you. Using the Swytch system had brought back my love of cycling. I cycle everyday. I have also managed to get more km’s per battery than I thought I would. I originally got the lowest km battery and have since upgraded to the pro - this is because I am now enjoying going on longer rides something I haven’t done for years. The batteries charge very quickly (they do not take hours) best to charge in wall socket plugs rather than extension types) I can’t think of anything negative to say - although perhaps check your wheel size, make sure you do not have drum brakes and your fork is the open sort. That said if you don’t have a suitable bike it’s worth picking up a second hand one.