Zipp's VukaShift extensions represent an elegant solution to the traditional problem with S-bends: the shifters are too far away if you grip the curve of the extension. By integrating the shifter boss into the extension itself, Zipp not only creates a bar that's more ergonomic, but also lighter and sleeker. Cable housing runs inside the textured extension right from the shifter, so there's no housing to hide, and no need for bar tape. Color us excited.
Rolling the extensions inward causes the shifters to sit at an angle, which is fine up to a point, but makes extreme rolls unfeasible.