I have been commuting this year on a Trek 7700FX with absolutely no complaints. It is really responsive on the road, but is also very forgiving and stable when I decide to ride like a dufus. It will never replace my roadie, but for everything else it is perfect. I ride with SPD mountain bike shoes and use the clipless side of the pedals most of the time. It is really nice though to be able to flip them and ride on the flats with street shoes though.
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