So I was stuck between last year's M3 and the Bose 700. I saw these were coming out and wasn't sure. I did more research and was leaning towards the 700's to save money. I am primarily using these for WFH (music/calls) and the mic on the 700's is said to be amazing. As I researched I googled around and found that Bose has been having weeks of software issues and didn't want to get into that. I almost pre-ordered the M4's but decided to sleep on it because it didn't make a difference being in a queue. Finally one day, I found a YouTube video on the M4 and all my concerns were already addressed. I was sold.Yesterday (Aug 18th) these arrived at my door and I was on calls ALL DAY. They were perfect. Today, I get to enjoy music and silence –– HIGHLY RECOMMENDED.

Noise cancellation and audio quality exceeded my expectations. If you can afford it, buy it. If you can not afford it, find a part time job so you can buy it.I receive both a S-brand Bud+ and the Sony XM4 on the same day.In short, the Bud+ is garbage, no bass, average mid and high.The Sony XM4 is a must buy if your budget allows for it.Highly recommended.

definitely better audio-hi-fi than xm3 -- more openness and definition.note: to pair with my walkman wm1a i set up bluetooth pairing on walkman, BUT, as with xm3, i have to turn off the headphones first and restart them by PUSHING POWER ON, AND HOLDING IT PRESSED FOR 7 SECONDS. devices then connect.

Download Sony Headphone Connect App, open box, turn on headphones (bottom of left headphone on/off switch), using Sony Connect App, connect and paired new headphones. My headphones were 100% charged out of box. Many features in Sony Connect App which will require further review and tweaking. My headphones firmware updated automatically -be patient, process took several minutes. Initial impression; very comfortable, really good noise canceling and sound quality. Only used for one phone call, was told voice clarity is outstanding. I need to review all headphone app settings, features, and functionality for optimizing for my use. Easily connected two iPhones, my experience switching between them was seamless. Used ear profile in-app feature to analyze my ear shape for 360 Reality Audio setup. After a few days, will update with additional details and comments.

Loved the xm3 and now loving the xm4. Noise suppression is amazing as usual and the sound is the best I have experienced in a headphone (don't mind me audiophiles). They also changed the sounds when you increase/decrease/skip/pause from a high note beep to a more subtle, rich kind of music block sound. For example, remember as a kid when you would hit the toy xylophone? To me it sounds like that. Very satisfying. Mhm. Great headphones!

So happy I bought these, dont think twice just get it!