Great!
I come from an audio setup consisting of a multibit DAC and a tube amplifier, and what can I say except that I am really satisfied with this product!
The sound is really well detailed and, associated with a Sennheiser HD650, the sound quality is top notch! I had seen good reviews of this product in the press and now that I have had a chance to listen to what it has to offer, I am clearly not disappointed.