I actually think the Golden Crystal is one of the most overlooked IEMs I've heard in my time with portable audio. At the time of the release, perhaps it was priced a little higher than many expected ($300-ish, right?), so it never caught on.. but even at that price, I remember it sounding quite impressive and competitive. It had a pleasant coloring: a wide, u-shaped signature that had punchy, fun bass (that was focused in the lower-mid-bass & sub-bass focused).. a clean midrange, articulate, tonally impressive midrange.. and a crisp, open, fast, sparkly treble. It was surprisingly articulate and clear compared to many IEMs I had heard around the time/price of its release. Plus, the build was terrific. I've moved onto "bigger & better" phones since then.. but it remains one of the few dynamic-driver universals I still crave to hear again.