>>10524I've had them for about a little over a month now. Battery life is pretty great – I typically get about a day's worth of charge. Noise cancelling is really good at filtering out droning background noises like AC, fridge compressor, ceiling fan, PC fan, etc. It's also pretty good at filtering out most other things. I've taken them on a few flights and they're remarkably good at filtering out the engine noise. Earcup fit is pretty good, but my ears become a little sore past 5+ hours in my experience. LDAC is also super cool – sounds exactly like wired headphones. They are bass-biased, but you can change that through the phone app. Unfortunately, changing the EQ through the app changes whatever bluetooth codec is being used for one that prioritizes stable connection over audio quality. You can use them either through bluetooth or via the 3.5mm jack. Some people have said that they can notice a difference between using the 3.5mm jack and bluetooth citing that "it sounds worse because using the audio jack means it has to go analog -> digital -> analog, instead of just digital -> digital -> analog." Personally, I can't tell the difference. The only difference I can tell is that using the 3.5mm jack is noticeably louder than bluetooth. The side touch pad gestures might seem kind of gimmicky, but they're pretty useful to be honest. I often find myself using the touch pad to adjust the volume up and down. Range is also pretty amazing – in my own rudimentary testing walking around my house, I got a perfect signal through multiple walls all while being a floor below where my phone was.
I used to have a pair of ATH-M50x's, but they got stolen so I can't do a side-by-side comparison, but the Sony's are definitely "easier on the ears." Not really sure how to describe it other than that. By comparison, although the ATH-M50x's might have a more "accurate" frequency response, the WH-1000XM3's just "feel" better to listen to. Can't really tell, but the WH-1000XM3's also feel lighter than the ATH-M50x's. I prefer the folding and swivel mechanism of the M50x's over the XM3's – the Sony's can swivel 90 degrees "forwards" (if they're on your head, then if you put them around your neck, the cups would sit flat on your chest), but can only swivel about 20 degrees "backwards". And then they can fold one earcup over the other. By comparison, the M50x's can turn a full 90 degrees in both directions and fold up into itself so that both earcups meet one another in the middle. I'd say both have about the same level of build quality, but the XM3's have more, and better padding. Over all, I easily prefer the XM3's over the M50x's.
The one single downside I've had with them moreso has to do with my phone's bluetooth. My phone must have some really aggressive bluetooth connection settings, because when I turn on my headphones, intending to use them on my PC, they instantly connect to my phone and no amount of trying to connect to them on my PC will work until I turn off bluetooth on my phone.
If you can find one for a decent price, I'd say go for it. The one thing I have heard, however, is that the QC35 II's have slightly better noise cancelling and are a bit more comfortable to wear.