I have a Ruby Expert and have been riding the original Ultegra Wheels that came with it. Last month I did a century ride and borrowed DH Mavic ES wheels (he hurt his back so wasn't riding). Lovvvvved them so much, I decided I had to have a pair for myself. I searched CL and found a guy who was selling his bike with Mavic SL wheels. I contacted him and asked if he would be willing to sell me the wheels and I would give him my Ultegras so he could still sell his bike. He agreed, so I go the wheels for $500. He said there was about a 1000 miles on wheels, but really other than his word I couldn't tell. At the finish line of the double century we did last weekend there was a Mavic booth. The guy took a look at the wheels and said that they had very few miles on them, so I feel like I got a great deal. I absolutely love the wheels, so thumbs up from me on the Mavic Ksyirum SL's!!!