I've owned a pair for 5+ years. Stopped by the Hed factory and spoke to personnel for detailed information, and bought a set shortly afterward. The Hed tech recommended the RC6s vs the RC4s for overall speed, and they still are very controllable in crosswinds. My speeds increase when I ride this set of wheels. They handle great with the wider rims and corresponding wider tires (25mm usually). I love the stopping power of the rims-I use SwissStop BXP pads. People comment on the sound they make during riding, and also the turbine sound when stopping. Highly recommend.