I upgraded to these wheels from a pair of Mavic Ksyrium Elites, and they made a huge difference. They spin up quickly, roll beautifully, and are both more complaint over rough surfaces and a lot stiffer than my old wheelset-especially noticeable when climbing out of the saddle or accelerating. They look great and feel fast. They seem like amazing value to me for a carbon wheel, and I liked the options Reynolds had for warranty support. I deducted a star, though, because I couldn't get my clinchers on the rim-a sheepish trip to the LBS ensued-and so am not looking forward to my first roadside puncture.