My Bokeh is probably around 150ish hours in now and seems to have settled. I don't notice any changes sonically day to day now, whereas last week it was almost a daily discovery what new aspect I'd hear different. I've been using the Bokeh at work, at home, for music, for games, for movies, anything and everything I can throw at it, it handles with aplomb. Zach is quite the madman to make such an amazing sounding headphone and price it at the bottom of the price list. But don't let that price fool you, this headphone competes with anything else in the ZMF lineup and beyond. If you're a detail-head and love headphones like the Utopia, etc. then you might not be as impressed. But for those who forego details for musicality, and love a warm engaging listen, it's tough to beat, even within the hallowed ZMF halls. I know i'm a baseless fanboy, but I'm loyal by listen, not by person or logo/brand. If I didn't honestly love the sound, I'd jump ship without hesitation.
A few things I've noticed now that my unit seems to be broken in. First, it's not as ham fisted and stiff sounding as it was out of the box. Transients have rounded just a bit and have a more liquid/wet characteristic to them vs the slightly stiff and blunt out of box performance. Also the bass, though still insanely potent, seems to have mellowed out some. Maybe it's brain burn in (most likely), but I don't find it as overbearing with the protein pads as I did. Not that I disliked it before, quite the contrary, but I did note it could dominate my attention. And to some extent it still does, but only because it's so dam fun sounding. The bass is quickly becoming my favorite of the ZMF lineup. It's also transmitting more nuance than it did when new. It's still not as subtle and delicate/nuanced as the AC, but it's noticeably better than out of the box. Finally, the stage seems different. I can't put my finger on it, it's subtle, but it's different. How so I'm still gathering thoughts, but i'm guessing it has to do with the more relaxed drivers giving more subtle spatial cues. I'll add more thoughts as they come to me.
I'll add I found a great budget solution that drives the Bokeh well with incredible synergy. I picked up an iFi Zen Dac 2 and Zen Can combo awhile back when someone was fire selling them in the classifieds, mostly for curiosity. Never used it that much, but figured I'd give the stack a try with the Bokeh. I loved what I was hearing. The Zen stack isn't the most resolving, but it's smooth and dynamic, which pairs well with the similar Bokeh. The bass was slamming, no glare up top, and overall I quickly forgot I wasn't on tubes and got lost to the music. I briefly tried the bass boost but that was way too much bass for me. But I did like the cross feed button quite a bit. It gave the Bokeh an almost surround system type soundstage. Not the most natural sounding, but really fun with games and orchestral pieces.
Finally I wanted to expand on my thoughts on the Bokeh with acoustic music. If you need ultra resolution to break down the plankton in the recording, then look elsewhere. But if you listen for the emotion of the music, IMO the Bokeh is every bit as good as any of the ZMFs in the lineup. It has a wonderful balance of full but not overly forward mids, very present but non-fatiguing upper mids/treble, and of course that luscious bass. What I found with acoustic music, especially jazz and singer/songwriter tracks was it quickly engaged me with it's macro presentation, and is more than resolving enough to give me all the elements I need to hear, without overwhelming me with micro detail. Grain of salt I am not a detail head. I don't put much emphasis in resolution, I value coherency and engagement at a macro level above all else. But jazz beats just got into my head immediately and had me tapping my toes and bobbing my head. Very engaging. Orchestral pieces were intimate sounding but not overly so, I could break down what I needed to, and it sounded quite good. I'd still take the Atrium open for it's more expansive stage, but the Bokeh was every bit as fun. Finally vocalists, especially soloists, where quite enthralling. The subtle breaths and volume gradients came through with good separation and presence. But the overall tone was just on pointe. I have a soft spot for the song Ave Maria and spent a few hours just listening to the many renditions of it on Tidal. I loved the more sparse sets that put the instruments far in the background so the singer was front and center. I adore Aaron Neville's rendition, and must have repeated it a dozen times. I've listened to that track on all my headphones regularly throughout the years, and the Bokeh nails it as good as any. Twist my arm and I'll put the Auteur OG and Atrium open slightly ahead of it for it's slightly silkier and nuanced performance, but for pure goosebumps the Bokeh delivered as good as any.