I have had mine for more than 2 years and they are better than ever. yeah they have your typical minor paint chipping. I could have taken care of them a bit better. but 12 hours listening sessions a day does just that. I listen to them in my bed too and I fall asleep with them on my head too ah ah. I recently upgraded my dac and they have surpassed my he-6. I had an asus xonar essence stx. for the past 3 years as my main source. I plugged all my amps into it. I liked it because I could play with equalizer. on that setup he-6 had better sound. but it was not worthy of hd 800 as dac.
now I have hegel hd25 dac. sound quality has increased dramatically. and I d'ont need to play with eq anymore. sound is incredible. what I have discovered is that hd 800 scale more than any headphones I own. I have not heard the stats like sr 009 but my hd 800 has increased in sound quality more than my he-6. that dac upgrade was the missing link of my setup.
now I want to upgrade amplifier for hd 800. but I fear it might not be worthwhile. ef-6 does a tremendous job as amplifier with hd 800. it gives weight to the sound and keep treble in check.
I have removed the inner liners inside the cups a long time ago.