A best-selling product primarily because it offers a significant, audible improvement to high-end audio systems at a fraction of the cost of traditional high-end upgrades. Its popularity is driven by its ease of use, versatile application, and a strong "word-of-mouth" reputation among audiophiles who describe its effects as "acoustically transformative". It is widely praised for creating a "cavernous" and immersive 3D holographic soundstage. Users note a "pitch black" background and a reduction in digital "smear," which allows tiny details and musical decays to become more audible.