I have had this cable set sitting around for when I needed cables on my bike, but ended up installing them on my girlfriend's new bike build last weekend. I was impressed with the quality of the cables, as well as their great looks. The shifting on the Campagnolo 10 speed drive train is crisp and accurate.
Stiffness is an issue for my bike. I was unable to use the brake housing at my rear brake as the bends were too tight and drag increased significantly. Otherwise the set seems to work as expected... but I am not sure the benefit is worth the limitations.