I use my mtb to commute because I had a $500 bike I didn't get to ride as much as I wanted. I am fast enough on it with the 60psi Kenda Krisp 2in tires and suspension fork. A friend of mine that rides a road bike can attest to that. Now I have a rigid fork and 100psi 1in Richey Tom slicks on their way. In addition to that I can stop carrying around a floor pump strapped to the side of my milk crate as I have an inflater on its way also.