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The XM3's are by far the best set of headphones I have ever owned in terms of sound quality, battery life, comfort and spec. The look, feel and sound are certainly worth the high cost, however I would NOT recommend anyone to buy these headphones.
After a few months of audible enjoyment I was devastated yesterday as I put my headphones on to find the headband had broken. The headphones are in otherwise perfect condition as I am very careful with them (considering the price you would be). They have not been dropped, sat on or damaged in anyway. On inspection I realised that a small piece of plastic where the adjustable headband comes together has broken off, which means the left cup is not completely detachable. Looking on the other side, a similar stress crack has also appeared.
It seems as though the design has placed a small clip under the piece of stressed plastic, which when extended places additional strain on a weak point. Seeing that this appeared to be a design flaw, I looked online to see if others had faced the same problem. In fact this seems to be a regular problem with this model, with some cracking after only a few weeks of use.
I have contacted the Sony Support team who have informed me that this is not covered under their warranty, and it will cost in the region of £80 to have it repaired. It is completely unacceptable that a high end product such as this has a clear weakness in its design. I would be very cautious about buying this product...
Other complaints of exactly the same issue:
https://community.sony.co.uk/t5/portable-audio/wh-1000xm3/m-p/2646721
https://www.reddit.com/r/sony/comments/9rljs3/does_the_1000xm3_still_have_the_hinge_cracking/
https://www.amazon.co.uk/review/R3PJHVNC64LUCC/ref=cm_cr_srp_d_rdp_perm?ie=UTF8&ASIN=B07GDR2PH9
https://www.amazon.co.uk/review/R2KP9SL1SUA7R7/ref=cm_cr_srp_d_rdp_perm?ie=UTF8&ASIN=B07GDR2LYK