I did have the same experience and I couldn't agree more with you. So far, I only tried a 20€ toslink cable on my Auralic Vega and Benchmark DAC2 (I'm about to receive a Sysconcept highdef toslink). On both of them, this simple toslink sounded much sweeter, detailed, natural and holographic than USB (haven't tried by coax or AES). So I stopped using the Macmini as transport. Instead I'm using a simple bluray player: less is more.