I bought a pair of the Sony XM4 when they were on sale for Prime Day. I have to say I'm a bit disappointed. The noise cancelling is excellent but the audio quality sounds tinny. My old Bose QC15s sounded much better. And my Grados (which of course aren't noise canceling) sound better still. I've tried adjusting the equalizer in the app but can't get it to sound good.

I bought them mainly for noise canceling on flights (for all the flying I do these days lol) so I'm more interested in the noise canceling than audio quality, but it's disappointing to hear crappy audio in $200+ headphones.