There are no comprimises when using a ShiftMate. Your shifting will perform equally or better than original factory components. 2001 and newer Campagnolo shifters and derailleurs are not compatible with older versions.
Jtek ShiftMate 6
Jtek ShiftMate 1
Jtek ShiftMate 7
Jtek ShiftMate 8a
Jtek ShiftMate 9
Jtek ShiftMate 3