I realize that I've been a bit stingy about my impressions for the V3. I'm working on listening to them as much as possible to really solidify my thoughts on them. But I will say that they are quite nice. Definitely a good buy for the asking price.
Sound signature is warm, smooth, spacious, and just very musical. I can't really think of another word that defines them better than "musical". Bass is significant - these things don't pretend to be neutral. But it's not quite big enough to where it would likely overwhelm someone (though a few people might feel that way).
These things remind me of a junior version of the spectacular Heir Audio 8.A: they aren't exactly the same sound but definitely along the same lines. Of course the 8.A, being a $1300 top of the line model, can do some things that the V3 can't. But at 1/3 of the price that's to be expected. Still, the V3 acquits itself very well. I also think the V3 has a lot in common with the Audeze LCD-2 in terms of tonality and overall "feel". Again, the LCD-2 being far more expensive, can do some things better. But honestly the V3 is not terribly far behind. They are definitely in the same family as far as general sound signature.
I know that isn't a lot of detail but hopefully it helps someone in their preliminary search for the right CIEM. If your ideal sound is the Beyer T1, or AKG K701, or Grado RS1, and you want a custom IEM with a similar sound, then you should be looking elsewhere. But if you dig the warm, liquid sound of the LCD-2, HE400, Heir 8.A, etc then the V3 is a great option.