I had a '09 Cervelo S2 which had the terrible ICS-2 cable routing. You had to manipulate the cable housing to form a "L" shaped bend. It had to enter the top tube to turn towards the headtube and then run back to the downtube in order for the cable housing/ferrules to line up perfectly to a mounting plate. I originally finished the build with the Jagwire Racer kit since that was what I had been using in the past and figured it would be fine. Not even 10-20 miles on the bike and I could not get the shifting up to par; plenty of slack in the shifting and the sram force levers felt much more difficult to shift on this build versus the Kestrel RT800 build it was on previously.
I did some online researching and read plenty of recommendations for Yokozuna cables. I will admit, the Yokozuna cable and brake housing was even harder to cut, bend, and route. But once I was done, the difference in shifting was exactly what I had hoped for. Everything was spot on, front and rear shifting was never an issue after switching to the Yokozunas.

Currently, my favorite and go-to cable kits are Alligator i-links. Besides the aesthetics of the kit, they work just like nokons that use segmented housing but without the higher cost. They don't compress or blow out either, and I would compare them equally to Yokozunas but without the difficulty of having to cut the cable housing.