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I also looked at the B&W PX headphones but I found them far too tight.
I like my B&W PX but some people find the fit too tight or they're too heavy on their head.
I'm currently annoyed with them because they won't connect to my Chromebook Pixel via Bluetooth any more and now the connection via USB has gone flaky too. Although I think it was a Chromebook update that did it they won't connect to my Windows 10 now either. They're fine with Mac OS/Android but I'd quite like some headphones that work all the time please...
Only problem is when I listened to the Sony XM2's I didn't like them. Maybe the XM3's sound better?
Do they reliably connect to bluetooth?
I bought a pair of the Boses and then subsequently exchanged them for the Sonys.
When I compared the technical specification between the Sonys and the Boses, it was clear that the Sonys were better. And the newer version is, I think, even better (i.e. I have the XM2). That said, I don't know whether my ears have really been able to detect any material difference... And the Boses are really comfortable, and they look great.
I also looked at the B&W PX headphones but I found them far too tight.