Not sure about yellow V's, saw some green V's which were these double stacked (looked actually triple stacked - can you get that? They certainly seemed higher stacked than any pills I've seen before {Note: I was stoned}) a while back. Their press was of that energy drink "V" I think.
I'm not actually positive (ie. Don't quote me on this), but from memory they were meant to be pretty crap indeed.
As assumptions go, they probably were crap which is why I didn't buy any...I'm pretty sure they were cheap, if they were good I would have bought em. But as I said, that's just an assumption...
Sorry, that doesn't help you much out at all I'm afraid (prolly just confused you)....Can anyone else give more info?