The reviewer's general tag line for the Zodiac Gold is "
Clean, Neutral, Accurate & Desirable"
They talk about how the headphone amp is trying to present "just the facts", which I think is fair. We're not hyping or adding to the audio. Our products are designed and intended to present audio as it actually is.
He does summarize the headphone amp with this "In our eyes, though, the Zodiac Gold’s honesty and neutrality are both big plusses."
See the full review here