When paired with a lined outer cable, those Shimano inner cables give your brake operation a smooth even application of the calipers, which never need to be lubricated.
I bought this to replace the Gore junk that came with my SRAM 22. First, the shifting cables went bad within 5 months then the brake cables went out within 10 months.
I build my own bikes. They are well cared for, cleaned after each ride (mostly), and detailed every other week. Not sure how the original Gore cables could have lasted this short. I each case I have replaced it with the top of the line PTFE Shimano cable and the shifting and braking has been better than the OE that came with the SRAM.
If you have ever dealt with the SRAM 22, you must know how finicky they are to setup. Once I switched to the Shimano PTFE cables, I finally was able to enjoy the benefits of the 22.