Update: So below is my review of my unit of the GK10. However, it has become clear that there are varying units and possibly QC problems. I would not recommend this IEM to anyone as long as those are not solved, and have therefore deducted a star from my initial rating of 4 stars. I like my set, but since there are multiple graphs going around and there have been reports of QC issues, be aware if you consider buying these. Intro I ordered the GK10 because I wanted an IEM with a piezzo driver in my collection, and I thought this one looked...