WOW big purchase haha. Those cocobolo are gorgeousss. I hear the Hifiman Hex v2 were a more musical HD800. How to the Aeons stack against the zmf btw?
Haven't heard the Hex v2. My Aeons are the closed version. They're very good technically, but I do have two complaints: very small/closed soundstage, and a rather shouty midrange. The latter is due, I think, to some excessive ringing in the 1k-2k area, and I find that I'm very sensitive to ringing in that area. I have to use EQuilibreum to EQ down that area, which throws off the overall balance a bit, but it's the best I can do. Other than that there's not much to complain about, except perhaps that they're a bit boring. They lack the musicality/tonality/warmth and micro-detail/tactility of the Eikon and Atticus. Aeons also have that Planar-thing that tends to sound a bit over-smooth at times... hard to explain, but I can especially hear it with rough-around-the-edges rock and metal music, where guitars should have some grittiness to them they sound too polite and hollow on the Aeons. Though I'm a big believer that measurements tell much of the story when it comes to sound quality, the Eikon/AtticusVS Aeon may be one of the rare situations where I think the measurements are... if not misleading, then at least not totally representative of what I'm hearing. I know I certainly prefer the ZMFs.
That said, Aeons are great for the price and I find it hard to argue against Tyll's WOF placement, but I don't think they'll be a headphone I find myself reaching for often compared to the others in my stable. I just don't see a niche that they really fit. For a Planar I pretty much entirely prefer the HE-6, which may still be my overall favorite headphone (though it requires even more careful EQ tweaking to sound right).
EDIT: TL;DR Version:
Aeon:
+Smooth & neutral frequency response
+Very clean (low distortion)
+Transparent
+Comfort
+Price
-Shouty 1-2kHz (ringing?)
-Soundstage
-Planar-y too-smooth presentation
-Somewhat boring
-Microdetail
Eikon & Atticus
+Tonality
+Fun without being TOO colored
+Micro-detail
+Punchy (Atticus), Resolving (Eikon)
+Aesthetics
-Rougher frequency response
-Shelved treble
-(Mild) distortion
-Heavy (Doesn't bother me but might others)
-Bass boost might be a hair more than "tasteful."