Pretty close to the V3, which is held back somewhat by its heavy bass, in overall SQ. However, I wouldn't call it an upgrade from the B2 and GR07BE because of its significantly warmer, more colored sound signature. The V6-Stage makes for a much better upgrade from the B2/DBA or GR07 because it's also quite neutral, just performs better on a technical level. There's an SM64 comparison in the V6-Stage review: http://theheadphonelist.com/headphone_review/1964ears-v6-stage/
Ahh, thanks for that!
When you have a great IEM you got for $100 and there's no clear upgrade except for a mid-range CIEM... #audiophileproblems