My Aud-6x'es arrived this past week.
I'll try and get a full review up in the next week, but the short version: More technically proficient GR07s with a larger and more three dimensional soundstage, and a bit more bass (seriously, the mids and highs are pretty much identical to the Vsonics). Very smooth, plays nicely with every recording I've thrown at them so far, but very detailed.
Considering that what I really wanted in the first place was a custom GR07, I am very, very pleased, to say the least.
That's very interesting, as I really like how the GR07s sound, and more isolation would make them borderline perfect in my book. Just wondering, why did you go this route vs. getting custom tips made for the Vsonics (mostly asking because I'm strongly considering getting custom tips for mine)?