Sounding darn good indeed and I'm loving it. Did not want to post impressions here since the OP went with another product and would seem moot, since it's his thread. Recently rocking some D5000s, Ultrasones, Grados. Great little box indeed and very versatile. Thinking of starting an NFB-15.1 impressions thread, but don't know how many folks have pulled the trigger.
Here's a pic I posted in another thread (15.1 hi-lited) of my little A-GD corner..
Glad you liked it, I bought a unit and Im gonna get it this week to fit with my Signature Pro , cant wait to try this dac/amp !