Same question here. I've never been able to feel any difference in handling, comfort, etc. between a Kevlar-bead (i.e. folding) tire and the same tire with a steel wire bead other than due to the small difference in weight. On pavement you get slightly better traction with slick tires than those with siping or knobs - so that shouldn't be a concern at all. And I agree with JanMM that if you want to reduce the feel of vibration from the road the way to do that would be to use a wider tire at correspondingly lower pressure and use a tire with the most compliant sidewall.