I purchased these wheels as a set from the Specialized website at the recommendation of our LBS since there are not many sets available and they are a direct replacement for the ones that came on the Enduro. I understand the benefits of stepping up but just didn't have the money to spend on the Carbon version at twice the price. They are solidly built and use a slightly different side wall than the previous version. The internal hubs are also different and are actually quieter and very smooth. Overall very pleased and looking forward to the next race to truly test them out.