Based on what I've heard so far, especially in comparison with Stealth and others I love, I am let down by the hype as well. Judging by the reviews, I expected to hear a big open soundstage and I'm not hearing that at all. If these were called Ether 3, implying that these were going to be darker/warmer/thicker headphones, then I would have been more prepared for this signature, but to call them Expanse and reviews rave about their soundstage being big, spacious, or open, that certainly seems contradictory to my listening experience.
Pros for me are definitely the bass (if you like a lot of it), the warmth, the smooth treble - but not the soundstage. That, imo, would be a weakness of these compared to other top tier headphones that I've personally heard.
I've owned every generation of Mr. Speakers/DCA headphones, open and closed, since the OG Aeon. I know DCA headphones' closed headphones tend to sound more open than their open counterparts, but I was hoping that would change with this one. IMO, this keeps following that DCA tradition. The Stealth sounded more open than the Expanse to me, from memory.
I think if you are looking for a more neutral signature that keeps everything in perfect balance, including soundstage, then I would recommend the Stealth. If you want a darker, warmer, thicker presentation that brings a bit more life-like impact to the bottom end, then consider the Expanse. That's my thinking right now.