Stealth PGS-08 cables

Any opinions on Stealth PGS-08 I/C cables? I took a pair on loan and cannot stop listening! Before that, my NAF Legend-II amplifier sounded annoying because it had some sort of electronic "sheen" or artefacts. The Stealth cables smoothed it down and removed all impurities. These cables are neutral and effortlessless and I am wondering what would be the effect of more expensive Stealth cables.