7800 brifters work best with the brake callipers you already have. Shimano's first foray into hidden shift cables was less than stellar, many people were disappointed with shift performance. The exposed shift cables are less attractive, but the cabe routing has none of the sharp bends that concealed cables have. Had not both SRAM and Campagnolo already been offering concealed cables Shimano might never have gone that route. When Campagnolo was the only alternative,Shimano stayed with exposed cables