I bought a pair of Sennheiser HD555 From iFocus. There under a year old, But after about 4 months of owning them they started developing cracks on both sides of the head band just above the ear cups. After looking on numerous forums I found out its quite a common problem, some people said that the cracks of theirs hadn't grown so I didn't worry about it for a while, but mine now have continued to grow . Just when I started to love the sound of them.
I've contacted both iFocus.co.nz and Sennheiser and both companies havn't replied back to me, pretty darn piss poor