It was mainly a change in build quality right as there was problems, well i have the V2 and of all the IEMs i have tried, this and the FAD Adagio III are the only to were the air has moved and properly pounded my ears.
As far as I know VB v1 and v2 are two different sounding IEM. It is not about build quality issue as I have seen the v2 and it looks pretty much the same as v1.