Kona built a bike called the Sutra that we stocked at a shop I worked in. It was a full 105 touring bike with Avid BB-7 road brakes. This was a great seller here in Washington because the discs added better wet weather performance and less rim wear for winter commuting. They do weigh more. And any decent shop will be able to work on a cable brake. They are as simple to adjust as a linear pull brake. The pads will last longer on a disc than any caliper brake. For a touring or winter commute bike, disc brakes make a lot more sense to me than calipers.