I have Zipp 303's, SRAM Red callipers and Corima brake pads on my Wilier. It stops very well in the dry, although still not as good as my disc-braked Trek.
In the wet, zero contest, the disc-braked bike is far better. Doesn't stop me riding my Wilier, I just take into account the different braking characteristics and I've never had a braking incident where I could not stop when I needed to. In fact, I choose my Wilier for racing - albeit due to weight over all else.
I'm still very much a fan of rim brakes and carbon hoops still work with the right pads. However, there is no denying that disc's are, ultimately, better.
