I had them and had a couple of problems. I broke a front spoke and it caused the wheel to come out of true to the point I had to call someone to come get me. I pulled a spoke on the drive side rear through the hub flange and that was the end of them. I'll have to add that I'm a big guy (upwards of 220) and race, and I have to put out a boat load of wattage just to hang on with the lighter guys. I even tore a Campy cassette cog in half at one race. My point is that I'm probably harder on wheels than most people. The owner (John?) is a nice guy and very helpful.