Chains are built very well now days, a few years back we took a long trip with the Rocket crew and we had all 3 configurations, wife riding a Spyder with belt, daughter riding a Ninja500 with chain and i was riding the Rocket with shaft, total trip was about 4000 miles, starting in Tulsa, to SD, Montana, Wyoming including Yellowstone and everything in between, many here remember that trip im sure.
zero problems with the bikes. i would trust all for sure