I'm pretty sure that Dan got a Burson recently. I'd still put the lyr up against it any day. I just don't you'll find a better pairing.
I always use a Dragon Fly with my Mad Dog, and still love it very much.
Actually, E12 is not a good match due to synergy IMO. Though I like E12 a lot... (check my review and it's obvious I'm almost biased against everything that didn't have "E12" in its name)
IIRC, Dan brought along a Burson Conductor:
And I didn't hear the Mad Dogs through it, but my brother did. Here's what he has to say about it:
Very clean, clear, with excellent sense of space and presence. Vocals were hauntingly good, and instruments were clearly distinct.
He preferred that pairing (MD + Conductor) to the LCD-2 and HD800 right across the table (that was Schiit's table if I'm not mistaken), so that says something.
I heard the Mad Dog through my BH at the SF Bay Area meet.
It was alright. I felt the MD still needed more power to shine, though the pairing definitely had much better synergy than the Fiio E12.