I'm building a Specialized Allez DSW sprint and was looking at the usual aero wheel brands, Enve, Zipp, Mavic, and Boyd. The U.S. prices for Campagnolo Bora Ultras exceed even Enve's with high end ceramic hubs. But in UK and German online shops they are going for nearly half that. The price and glowing reviews based on user experience online has me interested. I have heard some negatives like high replacement part costs and slow part delivery. Anyways, for those who own these wheels, please share.