"That is some good marketing ("Driven creates 49% less friction"). That statement isn't super meaningful as chain drives already have very low friction. What is meaningful is how much of an efficiency gain it would produce (Efficiency = Power Out/Power In, and Power Out=Power In - Friction Losses). Chain drives are already 95-98% efficient, so the biggest possible gain would be ~5%.  That being said, it wold still be cool to see a working version."