My main commuter is a nice little Rockhopper mtb that I finally took off the mtb OEM tires from it (after 4 flats - due to glass mainly) and put on a Specialized flak jacket tire (went from 2.1 to a 1.95 tire) - tire has more tread than a mtb tire and so far so good (I prefer a mtb for where I ride - even in inner city due to the sometimes MASSIVE sink holes/potholes I ride over). Only read one bad report on them that they draw stuff up into the tread but like I said - so far so good. I ride inner city with crap all over the road and for some reason this year I'm seeing glass all over the place. And have dug out some glass from the treads with no ill effects too.

Have Armedillo .23s on my roadbike and have to ride out of the city in order to go get some miles in the country. While I'm not crazy about the look of them - they really do seem nice for a touring kind of ride - as it is - I ride mainly solo and do long distance so the less problems I can avoid - I will.