Last week I swapped out the stock Giant 32's that I ran at 80 psi with Schwalbe Marathon 28's and pumped them up to 100 psi. I'm thrilled with how it rides. Gained a ton of speed, easily 3-4 mph. I don't find them harsh on the road at all. The trails I ride are all very hard packed limestone and are like riding pavement so they should be fine. I'll find out on the Tour the Montour ride this Saturday.