I have a set of Williams System 30s. Also, Williams is a club sponsor. I had a PowerTap installed in the wheelset and use them for training and racing. I have other carbon wheels as well that I use for racing. I purchased the System 30s for the deeper section look and metal braking surface. I do not like the carbon braking for training when doing long descents. Racing is different since I brake less and keep up with the pack.

I did two tough rode races on the system 30s. One had 6.5 miles of Paris Roubaix style rough road. The other was a 70 mile road race with about 15 miles of rough road. The wheels performed perfectly and are true.

Williams customer service is excellent. Good luck with your choice.