Centaur 11 is very solid stuff. Shifting is crisp and reliable. For some reason, the nondescript brakes are outstanding.

Note that according to Campagnolo, Centaur 11 is stand-alone, as in the shifters in this groupset have to be matched with the rear derailleurs. I once checked the cable pull of Potenza 11 versus Centaur 11, and could not find any measurable difference, but Centaur 11 is inexpensive enough so as to not justify futzing around with mixed drivetrains.

Since Centaur 11 is Powershift, Ultrashift rear derailleurs are not a good match either, if for no other reason that the Powershift shifters are overpowered by the stronger springs in the upper-end derailleurs. I have not measured the cable pull of post and pre-2015 Campy 11-speed Ultrashift shifters to compare against Centaur 11, but again, I felt no point in mixing and matching these components.