Have you tried a thumb drive directly attached to the NAD or a Squeezebox Touch via coax?
No - but I have read the thumb drive is not as good as standard USB. The Off-Ramp simply blows away the standard USB. I had a guy over today who was awe struck how good the NAD was and shocked with the difference the Off-Ramp made.
He agreed with me - if you are putting a system together simply get this NAD and then listen to other stuff to get exactly what you want - however you will be searching for a while to beat this.
It annihilated a Playback Designs MPD3 for example. I originally thought it may have had my PDX by the short and curlies but it showed its true colours when fed into a heavily modded Spectron - yea that's the type of amp it takes to best this thing - I rate the Spectron above Mac 501's.
Thanks
Bill