Google the serial numbers this affected too, mine have been fine
Yet again, please google 'sony headphone crack fault' and you will see why these are out there.
PM me if you want to smell my used headphones before deciding on buying some.
I have a pair (bought from Dixons Travel for £280, down from £330 iirc) and the quality is fantastic. I have also used the Bose QC35 and I prefer the sound quality of these. I do know of some people who make good use of Amazon's fantastic return policy, where they buy either these or the QC35 for an upcoming holiday, and then afterwards they return it. They get free use of noise cancelling headphones for a long flight, and you get to buy them at a huge discount.