These are my second pair. I've had the first pair for 15 years, and finally the cable broke after commuting to work for 5 years. Now I have the first pair at work with a new cable, and the new pair is used in my studio.
Sound quality is detailed without becoming tiresome after 8hour use. Honest and dynamic sound where it is easy to hear nuances in what you play. Also, a good recording will be recognized, as well as a lesser one. However, the bad one is not unlistenable.
I really don't have any complaints. Just enjoying the music!
Comparing the new pair with the used one, there is perhaps a little bit crisper sound in the new pair, but the overall character is the same. What else can you keep using after 15 years nowadays?
The construction is very clever, with replaceable parts, and easy change of plug size with the provided adapter.