If you're going to be riding in rain, snow, mud, muck, and the like, then disk brakes would be a good idea.
If not, you don't need them, in my opinion.
I have them on my winter bike, and I like how they hold up in the snow. But then, not too many people ride in the snow (I do, I have studded tires for the ice, but people think I'm a bit looney).
Oh, and I REALLY like Jamis bikes. My commuter is a Coda Comp and it's just fantastic.



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