These are great. Received mine last week and had some time to take them through some rounds of sounds both contemporary and classic. For the curious, I'm using a modest but capable Schiit stack comprised of a Magni 2U and Modi 2 Multibit. Purchased the teaks without the intention of modifying the cups. Listening to digital sources, mostly flac from my library, but also from more questionable sources like Spotify premium. Cross referenced with Fostex PH, Audio Technica ATH-M50x, AKG K7XX, and some other cans I had lying around like some old Pioneer DJM-2000s and Sol Republic Master Tracks XC.
Without getting too technical, the sound is beautifully represented. Like many have stated here before, the tones carry this sort of smooth and buttery quality that flows through anything you throw at it. The highs radiate purposefully, the mids are balancing and not convoluted as mids should be, and the lows... oh man the lows. So fun. Oh yeah, and since some of us are comparing Fostex variants, the stage on the teaks is subtly wider. Not ridiculously 270 like the more open back AKGs, but enough of it and in an effortless way, like my ears weren't ever "searching" for the music. I think that, to me, this was the most welcoming aspect of these phones. I didn't have to try to find the music or even certain tones, it was all just there, if that makes sense.
Steely Dan - Aja
Dire Straights - Brothers in Arms
UNKLE - War Stories
All Them Witches - Dying Surfer Meets His Maker
Ryo Fukui - Mellow Dream
Alice in Chains - MTV Unplugged
Digable Planets - Blowout Comb
Henrik Schwarz - DJ-Kicks
The Starseeds - Parallel Life
Townes Van Zandt - S/T
Gillian Welch - Revival
To name a few.
Solid phones, pick them up if you get the chance! Your wallet will despise you temporarily, your cochlea will kindly disagree.