I was rather surprised, the bike feels much lighter, the power transfer from stamping on the pedals to the acceleration at the wheels is much sharper, coasting speed is higher, plus the distance compared to the other wheels is by far greater, climbing hills is easier, the bike over all is just faster and sharper.
I cycle every other Monday to a model club (plastic model kits) I'm a member of, normal time averages 27 minutes each way, last nights trip 21.18 and that's just at my normal cadence, but can't really add any opinions until I do a number of longer distances, I have a 18 mile loop and a 30 mile loops I normally do, so I'll compare the times and speeds to them.
But over all I'm really pleased at the change it has made, feels like a different bike IMHO
Norm