I just love the Arya. It has this addictive quality that can make you listen for hours on end without a hint of fatigue, yet the details and end-to-end extension are all there. The defining quality of Arya is its big driver, and the huge surface area is directly responsible for its 'wall-of-sound' presentation that makes it sound extremely open and spacious, like the sound is coming from everywhere around you. HE6 is the polar opposite, everything is super focused and condensed, you lose Arya's sense of space but everything sounds extremely focused. It's almost like its intentionally highlighting parts of the music that stands out. Plus it scales extremely well on a power amp. At the end of the day I kept my OG HE6 and re-bought the Arya. They are very special headphones.