These are the best-selling open-back headphones, but I sold them (The sound varies greatly depending on the degree of pressing to your head.
My head is small, for me the middle looks like a failure.
And if the head is large, then the ear pads are pressed and the place for the ears disappears)) Then it is not comfortable.
Once I bought original ear pads for the 990 and was disappointed to see that they differed from the original ones in size (they were just a different batch), even the left one was larger than the right one((. Since then I have been disappointed in "beyerdynamic".
I changed them to HD560S.