Day one report:
After 24h of burn in, these babies are starting to sing! When I first listened to them right out of the box, they sounded nasal and seemed to have a roll of on the highs. Now I'm totally loving the incredible soundstage and separation that I'm getting, and the clarity and depth of field/feel is incredible. It feels like sitting in the middle of a room while the band plays around me! I play the bass in a band and can totally understand why these are marketed for on-stage monitoring. Never gonna look back again!
That being said, the sound sig on these probably isn't for everyone. There's a slight mid-hump which makes instruments sound sweeter and totally brings vocals up front in the mix. That also results in the highs sounding a little less sizzly than what I'm accustomed to hearing. But that also separates the bass from the muddle in the bottom/middle and really works for me on stage.
One thing which I'm experiencing different from others here is that the bass right out of the box is pretty incredible. Anymore and it'd border on overwhelming... or perhaps I'm not that much of a basshead that I thought I was :p