I'm not aware that Di2 has proven any more problematic than cables. Plus, if you forget to charge your battery you get home in the small ring and all cogs. With a broken cable you are usually stuck with just one gear in the back. That said, I don't have any Di2 bikes. The bike is one of the few things I own that I can understand how it works. For some reason I've never been able to grasp electricity.
