I was having shifting issues with my new Pinarello F12 disc build, bought and installed the Shimano Optislick cable system and problem solved, shifts great. Highly recommended.
The "Shimano Optislick Cable Set" is a good value compared to buying the cables separately because the (cable casing) is included!
The ("Optislick" cables) seem to be comparably more resilient than the regular ("stainless steel" cables) that are available!