Yeah, not the simplest bike to work on, getting the chainguard apart can be a challenge, and all the extra bolts for the rear wheel does make fixing a flat more labor intensive. On the plus side, the shifting system itself seems quite robust, the system is powered by the front dynamo hub, the box knows how fast you are going based off the voltage it is receiving from the dynamo, and the rear wheel is basically a Nexus 3-speed, so you could even convert it to manual shifting if somehow the electrical system does completely fail. I have yet to come across one of these systems that didn't spring back to life with a bit of work, and I do know one mechanic who has thoroughly abused one as a winter bike that is still holding up well.