I finally got a set of Utopia in house. It's interesting. These are really wonderful for moderate volume listening. The treble quality and overall clarity are absolutely top notch for a dynamic, which I'd also heard in my brief audition. Great mids. Bass is good and satisfying; more bloomy than the Stax of course, which can be preferable at times. I'd say that the Stax 009 (w/ BHSE) still clearly has the lowest distortion from top to bottom, and better transparency. But moving coil drivers have a more weighty impact when notes strike; it's a more visceral, organic feel that has its own merits. Some folks can't get past the electrostats' absolutely deadpan delivery of GOBS of detail and separation. I think each can give different perspectives and insight into the same music, though for headphones I've leaned towards electrostats since hearing the 009 -- and I also feel that they have the lowest listening fatigue at any given volume level. To its credit, the Utopia greatly mitigates some of the traditional weaknesses of coil headphones: graininess, poor treble quality, lack of detail/speed.
Again, I'm not sure these are good cans for rocking out LOUD. But they manage to be extremely pleasurable at moderate to moderate-loud volumes (low-volume critical listening is not my thing). And if you can play lower and derive the same (or more) pleasure, that's a good thing! I quite like them so far. Reminds me a bit of Milos' (user: nerdling) he90 clone, in that it was a wonderful sounding top-tier headphone, but clearly best suited for moderate listening levels.
This pair has a balanced Silver Dragon. Though I greatly prefer pure silver cables 9 times out of 10, the Silver Dragon seems to be an exception for me; I never liked it much back in the olden days of HD650 cable rolling. So I'm looking forward to the Draug Silver I have inbound. This Utopia set also has at least 400 hours, so burn-in isn't an issue. I'm driving them with a HeadRoom Max Balanced -- though an older amp, it's really impressed me (personally I'll take it over a GS-X any day).