I have it, but haven't had time to really listen, it's not hooked up at this moment (still listening to my Stax).
Initial listen with the NuWave DAC and balanced Senn 580's showed real good promise, though, the music had me toe-tapping some. Detail, dynamics, some space, but not a big loss in musicality seemed to be the norm.
Recently just picked up a balanced AKG 701, it's able to eek out some decent bass from them. But something didn't seem quite exactly right to me with that match, need to listen more.
But due to room work, the whole system is offline at the moment. Hope to have it hooked up again next weekend.....