The ones youve linked are a good set, and wont wear like standard units. They give a good solid gearchange, but any alloy set do make the shift a little more notchy. Some like that, some dont.
If you want it as smooth as possible, get a new set of OEM ones from a Citroen Dealership. Theyre around £41.00 a set. The shift will be smoother than the alloy units, and theyll last for ages before they feel saggy again, much likely far longer than your interest in the car.