The original information when the company first launched is extremely difficult to find after all this time, even more so when its a Taiwan based company. From the start, VTX was the budget brand of TUL corporation who also make Powercolor cards.
Powercolor is the companies premium line, VTX is their budget line. Its not any kind of a negative charge to lay at them, they stated themselves that VTX is a budget line made to cost less than other cards.
That does not make them any more prone to failure than a more expensive card.
I get what your saying, i would rather spend a bit more for a premium quality card, and that's exactly what i did.
But there is a difference between premium quality, just plain quality and bad quality.
The VTX cards are all unlocked, voltage and all...
Still they only have something like a 5+1+1 or 8+1+1 GPU Phase, it's not quality like that Asus @ 12+2+2, but it's just fine.
My card has 5xR30 and 2 metal chokes, the ones on the VTX might only be 28 or 29 and alloy.
They all have good quality components, just of a lesser performance level.
They also run warmer because they have lesser design coolers.
You get the performance you pay for, nothing wrong with the actual quality.
But even the performance is a lottery, a cheap VTX card here and there will absolutely out clock my Gigabyte. it's just more often not true.
Non of them are 'Bad'