I have a 3910 connected to a 5803A. I use multichannel connections for SACD/DVD-AUDIO. I use optical for everything else. You don't need denon link to decode DD,DTS and PLIIx. But I also tried using the denon link. If you want you can try it also. If I use the denon link to pass DVD-AUDIO signals the dislay of the 5803 flashes 96khz. I guess to answer your question, what's the benefit of denon link? It's another digital connection similar to optical or coaxial.