Summary: I have noticed that the wires are starting to degrade at the plug, but for 5 years of constant use I'm fine with it!
Pros: Having been musicly trained and working in live sound for 7 years I can, without hesitation say these headphones are amazing! They seal brilliantly and block out sound as good as most sound canceling headphones. I have been using them everyday for almost 5 years and outside of scuffs on the outside nothing has changed.
Cons: I have bigger ears so the tops of the earcups sometimes squish the very top of my ears. If you have this issue just give the cups a little wiggle and it will fix it.