I voted for «undecided». Though supposing that «electrostatics are a better design philosophy for headphones», my standard headphones are my HD 600 and (to a lesser extent) my ER-4S. I'd like to listen to the newer, probably better Stax drivers, which possibly could change my preference, but so far I'm even too lazy to build a new headphone around the Stax Lambda Nova drivers lying around...
Based on my experience with the Stax Gamma, Sigma and Lambda models and primarily with my self-built two models based on Lambda and Signature Pro, I admit that electrostats are clearly superior in terms of resolution and soundstage, possibly also neutrality. It's nearly unfair to compare them with dynamic headphones, they leave no chance to them by swiching back and forth: they're much faster, clearer, more transparent, more airy and better balanced in most cases. The bass of the Lambda Pro was a weak point, but I guess the new models are better in this regard, as are my own ones, which leave nothing to desire with the bass.
Why do I prefer dynamic headphones in praxis? It may be due to the older drivers in my electrostats, among them the
Signatures are known to be somewhat sharp... though not at all in my design, there is a certain lack of midrange substance with both models, although the mids are wonderfully neutral and free of colorations. The HD 600's mids are more present, more substantial and warmer, while nearly as transparent and neutral, and the highs are rounder, lack the ultra-high electrostatic resolution, but don't miss resolution at all if listening without comparison and sound very fast, too. It's bass is more substantial and solid, a bit «faster», but lacks the electrostats' fullness, blackness and extension.
All in all I just prefer the rounder sound of my HD 600 and the more tight and precise one of the Etys. But I'm interested in the SR-404 and the Omega II, which could very well change my mind.
JaZZ