These are detail monsters. Every bit of detail in music is effortlessly rendered with lifelike clarity, perhaps even clearer than lifelike. Compositions with 3 electric guitars and 1 violin (Black & White from Blazblue OST for example) have been quite difficult for audio gear to render well because of how busy the upper mids are to my ears, and the V14 is the first to render this track flawlessly. For the asking price, I expected this, and it delivered admirably.
There are two things wrong with this IEM though that I think warrant docking a point for.
1: the pseudo CIEM shape. If it happens to conform to your pinna shape, these are just fine. However, just a bit off and these become near unwearable after 20 minutes. I happen to occupy both sides here; my left ear is shaped just right and my right is off just enough to rub the wrong way. The pain from the top winglet of the V14 rubbing on my antihelix is intense and lingering after not very long. Since these are so expensive, it's very likely worth it to get the custom version of these to ensure this doesn't happen, but IMO universal IEMs should avoid trying to engage with the pinna as much as the V14 does.
2: the tuning is slightly off from what I think is proper HRTF tuning. The pinna gain region is abruptly shelfed at just above 2k, imparting a darker sound to the overall signature. This is probably to avoid fatigue over long listening, but it also has the effect of negatively blunting female vocals & strings and shoving them down to the bottom of the imaging presentation. This ends up with an overall image picture of normal side and rear and a very noticable U right in the center. I pushed the 2.9k region up around 3.75 dB with a gentle slope to correct this pinna gain region and the imaging problem is gone (for me, YMMV), but for this asking price, I should not have to notice and fix such obvious and glaring tuning errors.
One other minor QC miss happened with my left unit as well when I was tip rolling. The nozzle fell right out with only gentle manipulation, and on closer inspection the resin hadn't been correctly finished on the left unit. Not a big deal since I fixed it with a little cyanoacrylic glue, but again shouldn't be happening at this asking price.
Overall these are keepers for me, but QDC needs to tighten up their QC and revisit their ergonomic design philosophy & tuning choices IMO.