I recently purchase these and I'm really impressed with the performance. However, the carboad packaging compressed dents into the ear pads, and several days later the pads haven't filled back out.
I contacted Sony USA and was advised that while there is a part # for the pads, the part # is not currently available. With the MA900 being discontinued I don't hold out much hope of the part # becoming available.
This is a frustrating situation - I'm thinking of returning the headphones due to the defect and lack of support.