I have been using a hub dynomo with lumotec headlight and taillight for several years on my commuter. Return trip is at night so I use it 5 day a week. I still use battery lights as backup but after a couple years charging the batteries has become more of a chore. Batteries last about 6-8 months before they no longer hold a charge and are about $50 to replace. Over the years the dyno hub was definetly worth it in terms of overall cost and provides hassle free light. Batteries also have to be disposed of, so dyno hubs are more earth friendly.