They're fine, they work, they're not as good as the D.A. 7900 or Ultegra 6700 brakes. But good enough. They're bicycle brake calipers, which don't work worth a damn even when they're good, the Zero G's are OK. Overall, worth it to save 110 grams, but it's a pretty stupid weight weenie move. I consider it my final descent into 41 Weight Weenie Damnation. The good news is you stop one floor above 33 Weight Weenie Damnation, where all the whackos with the Lightweight Wheels will reside for All Eternity, drinking flat non alcoholic beers with botto (he's the bartender).