Join Date: Feb 2007
Location: Auburn, WA
Bikes: 2006 LeMond Croix de Fer, 2005 Kona Dew Deluxe
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I'm new to dynamos, but laced up a wheel around the shimano disc brake version last month. I've commuted a few hundred miles and love it. I know that's not what you asked, but in my case since the hub internals were based on an Ultegra, and my previous hub was a non-series shimano - the dynamo actually rolls smoother than my last hub.
IMHO - $75 at JensonUSA was well spent for the shimano hub. I briefly considering the SON, but at more than 3x the cost, couldn't justify the marginal improvement in resistance.