I think it would be cool to have a dynamo light system, but it just doesn't make sense in my circumstances. I have 4 different bikes that I regularly commute on. Setting up the wiring and lights on all of those bikes would be expensive and a hassle. I would have to swap my dynamo wheel among bikes or buy multiple wheels. My LED rechargeable light cost about $100 and puts out all of the light I need, and I can easily swap it between bikes. It takes minimal effort to recharge. It weighs next to nothing (100 g). My commute route is also very hilly and long, and the additional weight and effort of a dynamo system would surely slow me down.