Energetic, bright and airy is the first impression GK100 gives me just out of the box. Some technical tunes (complex, not easy to render for some iems double the price, as Pat Martino 'On The Stairs' from Consciousness, 1974, Alice Clark 'Never Did I Stop Loving You', 1972, Andrew Cyrille 'Soul Brother' from My Friend Louis, 1991) are detailed and effortlessly well reproduced. The bass is definitely there, more defined and textured that prone to thump (no bleed). Mids and highs are better evident. I like the cymbals and snare drum fast and matheric sounds. I am using a Lotoo LP6k and a Lynsoul 'Nymph' 5N OCC single crystal copper, silver-graphene coated cable.
I'll put these to play ('burn') a whole week to see whata going to sound better.
First impression GK100 sounds worth the buy.