We love dynamo lights. Something about using the watts you're already creating to power a light that you already need feels good. That aside, there's nothing more annoying than having to transfer lights between bikes or make sure that your light is on the charger after (or before) every ride in the spring and fall when natural light is limited. Dynamo power can change your whole perspective on shoulder season riding. There's no battery charging to worry about. The light is on the bike. It is ready to be employed. That's what it is for. You ride the bike, rotation of the wheel generates power within the dynamo hub....you're happy cuz you're riding your bike in the dark and you didn't have to worry about chargers and heavy batteries.
We could go on about he advantages. If you're interested in dynamo systems give us a shout and we're happy to converse on the system that might work best for you.