My wife and I both have Continental "Tour RIDES" on our MTBs to use for use along terrain such as the C&O Canal (fairly flat dirt/gravel) and asphalt. These tires are very close to those of a road bike tire in terms of wideness. They roll very well and I wanna say I'm actually faster on my MTB with these tires than what I am on my road bike. They are also puncture-resistant, which is a definite plus!
We paid $35/tire for them and they are money well spent. I have nothing but positive things to say about these tires.