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They worked well enough, but I don't like the sound. When I eq'ed it using the profile from AutoEQ, they were ok-ish, but as a system wide eq in iOS is not possible, I stopped using the headphones.
I've had the PX7 carbon edition and the sound was better than the quiet comfort 35 Ii and much better than the Sony x3. The fast charging is 15 mins for 3-4 hours of play which is nice. The carbon fiber frame kept them light, and that version doesn't use real leather like the others if that's a factor. They're expensive but really nice.