Denon Link 3 is NOT activated yet on the 3910. I've had mine since Thursday and it switches over to analog for SACD. Not too big a deal. I pass DD, DTS, CD, HDCD, DVDv, and DVDa over the Denon Link. The Denon 3805 automatically switches to external in when SACD is picked up and no digital feed is sensed form the Denon Link. It works very smoothly and sounds great! Oh yeah...the picture is awesome! I thought the 2900 was great, but this puppy is amazing.
Hopefully the SACD thing is cleared up soon. Hopefully it will just be a CDr software update too. It seem pretty easy. It would just show up as DL3 in the audio setup menu.