It has been 2+ months since I got my SON dynamo equipped wheels built for my 700C wheeled bikes. I haven't gotten around to buying a front and rear light for the Cannondale T-800. So, I have been using the dynamo wheel only on Gikma, thus far. My ride back home is usually after dark and part of my route is through the Campion Trail.
Thorn Nomad as well.
The hub dynamo does add a bit of weight to the bicycle, and yes there is a bit of drag, but I would rather have lighting available at all times than worry about running out of charge on batteries.
Thanks, Chris! Approximately, one year ago, you heightened my interest in the splendor of dynamo lighting.