Great review! Very thoughtful and concise. Thanks for the comments on how they sound on different types of music, something that's important (to me at least).
Wow, 400+ hours of break-in needed? If that's true, I'd prefer one on the used market pre-run-in.
Yep, the HE6s definitely need upstream equipment that warms them up for me. They are not plug+play (not that any high-end phones are).
Did you find that the HE6s improved (meaning, for me, warmer) with break-in?
Thanks again. Would like to see more of your video reviews.