No other cable shifts as smooth as these polymer coated cables when they're new, however, the coating breaks down long before the cable does, and clogs the housing, thus making shifting troublesome. Instead, opt for the regular SS cable and just inject some lube in the housings before inserting the cable.
Great upgrade with any Shimano brake caliper system. Easy maintenance through 2 full years of 4 season riding.
The shifter reviews say that these cables may be why the Dura Ace shifts so easily. Why take a chance on using something else.