EagleWings
Headphoneus Supremus
I don't think it's worth $500 to upgrade to the A6. I think it's better if you saved up more money, and get like a A8 or A12.
@jincuteguy, I think what @bavinck and others in the past, are tying to say is that, you cannot make such subjective remarks when you have not tried the IEM. And even if you have tried the A6 and if you honestly feel it is not worth the upgrade over the V6-S, it would be better if you add a "IMO" in your statement to express your personal subjective opinion.