I've spent a lot of money buying two pairs of these headphones. They are truly exceptional when working, but with both pairs I have lost sound in the left ear after less than 5 months!
I wrote off the first pair thinking that it was just a freak pair and that the next pair would last longer. However that turned out not to be the case.
I still love the earphones and have advocated them to many friends, but I've now spent a lot of money & have two non-working pairs.
Very disappointed in Sony - a global brand I respected.