I remember Vanguard only too well
Didn't DST manage a similar trick, using phthalocyanine dye on a disc with a type-1 stamper? The irony was, if you used the discs on a good burner (TEAC) the write quality wasn't too bad (16x media wrote at 24x quite happily).
Vanguard always struck me as beautifully-made rubbish though. The discs had an air of quality about them that made you think you'd bought a good disc, until you tried to read the bloody thing back
The Vanguard DVD-Rs I had wouldn't read past 800Mb regardless of drive or speed. Quite the worst media I've ever come across.