What's difference between hifiman re600 v2 vs Final audio vi?
I did a mini review in this thread about the III, you have to go back to read it.
http://www.head-fi.org/t/674105/review-final-audio-design-heaven-vi/225#post_13194786
Now after you read about the III, the VI is a step above in every aspect of the III specially in the mids. They are even more forward and clear and the details are clean and clear. Highs are never sibilant and plenty of bass and mid-bass. The highs are comparable between the two. Everything else below the highs is where the real differences are. I like the RE-600's but I LOVE the VI as they are +3 in what they can pull off compared to the III and the III already is pretty fantastic compared to the RE-600.