@ascentale @moira I love the original Buffalo bicycles, but I didn't know they'd done an update. The dual chain thing makes sense to me, though I'd worry about the availability of parts: when you wear down that chainring, where do you get another one with whatever weird setup that has?
I have worked on a few shaft-drive bicycles and, though I really liked them, I always felt the same about those (too hard to find replacement parts).