beyerdynamic DT-770 Pro 250 Ohm

The clamp is so so so tight that it cuts bloodstream near your ear. This might be solved after some long long wear/use... that I'm not willing to wait.

They are so closed, that it's the equivalent of having an empty glass against your ear. You can hear the pressure as if you were underwater. Every single touch to the casing is a big thud directly to your ear drum.
Due to the overall high pressure, the feeling of vacuum hurts. You can feel low frequencies hammering your ear drums directly, too. As if my inner ear is being smashed by the pressure.

Beyerdynamic might suggest it's normal with Closed headphones, but you only have 1 pair of ears... Bayer have thousands of customers.

My ears are in very good health.

> DON'T use it as a regular headphone. DON'T get acustomed to them unless you feel confortable and safe.