I ran my P2 for almost 100 hours while I was away for my dad's funeral. I returned today and 'm listening to it right now, and it is very nice.
I haven't been in the mood to do ANY detailed comparisions yet. The D1 at this point has a bit more bass energy, and slightly smoother treble. But, the D1 opamps aren't stock, with the AD797 opamps in LR AD8397 in buffers, and it has about 500 hours on it, vs 100. The P2 is quite good though, with very good detail and presense/ambience, without sounding distant at all.
However, I have Predator coming and I likely wont get a D2 at this time. My D1 makes a great home amp, and the Predator gets to fight over my laptop with my Headstage Lyrix as a USB portable. I figured I had to give a smaller USB DAC/AMP a shot, not because I don't like the Lyrix sound, but if smaller sounds just as good, then I have to know.