The advantage of the tubeless system (if they are durable) would be the cost savings long term. I am not a racer so the I don't mind carrying a tubeless tire repair kit when I ride. As far as the weight goes was the tubeless system compared to a heavy duty tube and a rim lock? Another factor is the weight of the tubeless system is carried closer to the center of the wheel - would that make a noticeable difference in handling or acceleration?