This is my first ever review so bare with me.  My background in iem and headphones in general is limited.  Reference iem that I own and judged against the gr06 were jvc air cushion, klipsch image s2, meelec m16 and entry level sennheisers.  Soundwise they just blew away every iem I had heard until now, everything sounds better got great bass, mids and highs.    After comparing this to my other iems I finally understood what a veiled mid is, I was missing all this rich mid.  Vocals are excellent, hearing things I did not hear before like breathing...