Managed to visit Music Sanctuary today and demoed the QDC lineup. (3SH, Gemini, 8SH and the 5SH).
The Gemini, sound like having a freakishly huge stage. Non-fatiguing overall sound and very nice textured bass. Mids and treble are nicely detailed and sounds very natural. Not much hint of metallic sound that I notice common usually to BAs.
The 3SH hit me like a weird sounding IEM. It appears the soundstage is very compressed, smallish and imaging looks circular. I did not like how it presents the sound. Though it sounds fun and energetic, it appears something is lacking or sounding artificial.
The 8SH the most neutral of the bunch to my ears. If I don't already have a few neutral-ish iems like NT6 and Prophile-8, this could be the iem that would appeal to me. But on this particular audition, it strike me as a familiar sounding iem leaning towards being boring. Not that the iem sounded bad, it just sounded too familiar for me and I was out tonight looking for a warm-ish iem.
As for 5SH, this iem definitely has a warm tuning. However, unlike other warn iems I tried this iem still managed to maintain a high level of clarity in the mids and treble. The reason I don't like warm iems/headphone in general because, the upper mids and the highs are mostly subdued and rolled off too much so that the lower mids to bass can be emphasized. To my ears the 5SH is a touch warmer than Gemini having a smaller stage. Otherwise, they are more similar than different. Unlike the 8SH and the 3SH having a totally different tuning.
Overall, I enjoyed the QDC tuning. They have the most natural and textured bass reproduction I ever heard for a BA-based iem. The 5SH is definitely in my short list for the hunt of warm iem.