I have a pair of Real Design Ultrasonic wheels with about 1000 miles on them. Without warning one of the front spokes broke. Fortunately, I was going slowly and stopped without incident but the wheel warped rather markedly and lodged against the brake pad. The wheel has 20 bladed straight pull spokes. My LBS fixed the wheel, and said they could not find any particular reason. The manufacturer, via e-mail, also felt this was just a fluke. My concern is that given the rather marked and sudden deviation of the wheel that the consequences could have been ugly had I been descending at 45mph. Am I legitimately worried or should I just ride and forget it? The wheel can be viewed at the manufacturer's site (http://www.real-design.com/2005/ultrasonic.aspx).