Originally Posted by
pluc
It has indeed as much drag when off, but if you're like me and you always have it on because of the tunnels and such, it shouldn't really bother.
Yeah, for commuting it's probably not a big deal -- on my single commuter bike I don't really notice a difference whether the light is on or off. But our tandem is kind of a do-everything bike (because tandems are too expensive to have more than one), and we use it for long rides on the weekends, too. So I think it's worth a little extra money for the reduced drag.
Of course the Schmidt hubs are the best as far as drag, but that's more than a little extra money, so I'm glad I found a Nexus.