Includes left and right shifters as welll as cables and housing.
Campagnolo's new ergopower levers have a more difinable click and a all new hood offering better control and shifting.
I own Italian bikes and have never considered anything but Campy components, so I may be biased, but I think that this system is the best one available. I especially like the "button" shifters because they're much easier and handier to use than the nested levers as in Shimano. If you're installing this groupset yourself, be aware that it will require some special tools that even your local bike shop may not have.