beyerdynamic DT 900 PRO X

Sounds and comfort wise these and phenomenal. For an open headphone to have bass extension this good is no small feat. The comfort is also up there with headphones that are more expensive, the earpads are thick and there is no way your ears will be touching the earcup.

As for the build quality, the band is mostly made out of plastic, which caused the plastic bit underneath the headband to break and lower the tension on the headphones. This has happened to some people as well if you search up headphone forums/reddit.

One thing I would recommend against when using these headphones is twisting one ear cup to the side/back of the head when trying to talk to someone, I believe this is why mine broke.