I bought those same Cane Creek wheels when Nashbar ran a special on them around Christmas. I've been running them basically all year, and I like them just fine. I don't know much about the Ksyriums, but I have been quite happy with the Cane Creeks. I don't race on the Cane Creeks, but I planned on racing with them when I got them. I decided to buy a Renn not too long ago, and bought an aero front wheel to go with the disc. However, I would not hesitate to race on the CC's at all. Fine wheels. I think you'd be happy with them.