E3 = A pleasant surprise!
A little background about me, I can appreciate good things from Stealth and Expanse, but a bit hard for me to enjoy music through them. I also have hard time to enjoy closed back headphones (all brands) due to some resonances make me fatigue.
My initial impression about E3: Definitely still a family of Stealth in term of sound tuning, but in such more pleasant way. Still like inside well treated studio room, but more musical feel, energy, and emotion in each notes. It still sound neutral, but with a hint of sweetness that make me much easier to listen music as enjoyment. Vocal still take a little forward, but more harmony to treble and bass compared to Stealth. Smooth + fluid on top, natural on midrange, and tight + precise on low section.
Clean black background and pin point imaging are definitely TOTL level, combine with "open" soundstage feel, with tight solid bass notes and sweeter vocal, definitely one of the best closed back headphone I ever tried so far. I don't own DCA headphones (not yet), but if I have to pick up one, regardless the price, E3 will be in my top priority.
p.s: I use glasses when listen to headphone, Dan really does great job to make E3 has no problem at all with seal (unlike Stealth/Expanse that sound become thin and lack of depth if I use glasses with thick temples).