SilverWing----over 90,000 miles with 2 new ones, changed belts at about 15,000 mile intervals....never walked. At over 400,000 miles with rubber band drive scooters, on 11th new one, OEM belts seem to work best period-----the belt drive is the weakest link in the whole bike and deserves being taken care of.
Traveling---always carry spare belt as dealers won't have them in stock in case of break down.