Got em from the US and they are a substantial improvement from the XM3s in terms of noise cancelling, bass response and especially detail though only with LDAC. With SBC or AAC they seem indistinguishable from the XM3s to me which I used for almost 2 years. If you have an iPhone, get Airpods or XM3s, the main addition of LDAC doesn't work on ios and to me these seem pointless from that perspective. Water and sweat resistance is a nice touch too.

I bought these last week and just can't take them off my ear! I've always had a liking for Sony audio products. But these XM4s are on another level. I can't compare between various earbuds because I'm not an 'Audiophile' per se. But I think I'm falling in love with music as it travels to my ears through these buds. Following are the music pieces I listened to so far with XM4s and was pleasantly surprised. I'm using Spotify with 'Very High' quality audio stream settings. I've set headphone audio quality to LDAC.

1. Bach - Cello Suites Nos. 1, 2, 3, 4, 5, & 6. - The texture of Cello sound is just outrageous! It almost feels like I can hear the sound of the wood as the bow strokes across the strings.
2. Planet Earth II by Hans Zimmer - Zimmer's earthy compositions shine like diamonds as I could hear every instrument clearly with all their heft. There's no muddiness.
3. Girija Devi - Raga Piloo - Aisi Hori Na Khelo - The way vocals were accentuated and tabla and veena were separated but kept distinct was mind blowing. My brain cells were having virtual Holi inside!
4. Pancham Se Gara - Ravi Shankar & Anoushka Shankar - Again, amazing separation and distinction of instruments. Sitar never felt so lively.
5. The Grudge - Tool - I have never been a fan of metal but thanks to these XM4s, I listened to a whole album of Tool. And their songs are like half an hour long! The best part, for me, was how the buds handled bass. It's not too much or too little. Just the right amount. I'm glad that Sony understands this. They have a separate lineup for bass centric audio products. If you like that you can buy them. But if you like your bass just the right amount, Sony's got your back with products like XM4s.
6. I'm Tired - Labrinth & Zendaya - Oh My Freaking Lord!!! What an experience! It's a vocal heavy composition. And the way XM4s put the vocals forward and then fancy up the whole piece with instrument sound is amazing.

Finally, the ANC. It works great with continuous type noise. Walking on the street, or at a metro station and places like that. And by 'it works great' I mean it works flawlessly. Please don't walk in traffic with ANCs on. It could lead to serious danger because it shuts down virtually everything.

As far as comfort is concerned, I'm wearing them for as long as 4 - 5 hours continuously. Retains battery quite good. Slept off with them on a couple of times. No problem. But after 4 - 5 hours and a truckload of Spotify every human should take a break I guess.

A little note. And it's my personal opinion. I've discovered that XM4s are very good with vocal music. But they shift to another universe altogether if you play instrumental pieces with them. Then the XM4s show what they are actually made of! I remember listening to a Vivaldi piece and suddenly tears were rolling down my eyes. And they play Vivaldi in freaking weddings and anniversary parties. The way those violins were playing with piano movement was so full of life and exciting! And these XM4s were reproducing them exactly they way they were composed. It almost felt like I was sitting in an auditorium and the artists were playing at their best.

Anyway, I'm more than happy with my purchase. It is a bit expensive. But it was well worth it. Thanks.

I have been using the product for almost a week now and continuously. My take on the product.
1 The built quality is not up to the mark, the magnet is too tight and the case some how feels like a tiny box of plastic.
2. I am using a small eartip, which fits good but there is pain after some time of listening.
3. Music quality is just ok and as I have used other products of sony while comparing I feel this product doesn’t give me the immersive response. Some how I feel the sound is flat and an equaliser control needs to be used while we use this device.
All in all a ok product, while comparing with the price range, much better product are available in the market.
But as a sony fan, I am some what disappointed. But still this add to my collection.

Pretty good. Call quality could be better.
Unmatched sound and noise cancellation.

Hands down thr best earphones I have laid hands upon and when I say that I have used the likes of monster turbine, beats studio 2.0 and the usual Samsung Buds + and Buds Live.
Nothing comes close to these in earphones category and the bass is now intruding in thr category of headphones. Can't write a review about Sony !#!!$!$!$@$@ (the only bad thing is sony naming convention) without speaking about the noise cancellation. The noise cancellation is so good that at times you wohld wish less of it because these earplugs will shut the door on all noise from outside. And there comes the wizardy of the sony headphone app to thr rescue. Offers you all thr flexibility you would want to serve your lifestyle.

Summarizing thr review in just two words:
Love it!

These earphones provide one of the best sound qualities in TWS segment, cleaner bass, wider soundstage and top class when it comes to any genres of music. The ANC is also best in class, and the ambient sound is natural enough. The foam eartips I got didn't fit well enough and so I had to change it to silicon eartips and I was able to feel the difference in ANC and even passive isolation almost instantly, nevertheless it's still amazing. I haven't played with DSEE extreme for long enough, so I don't know the difference, and the battery life is also very good. Now, the catch part is two of the things that I miss with these buds are multipoint connection and good mics. I have had two firmware updates, one back in June when it was released and another one, few days back, and neither of those updates brought multipoint and I doubt sony would ever bring it. And gosh, the mics in these are just bad. I don't know if it was only with my unit, I had multiple instances where my voice was unintelligible. If you want a great pair of TWS with awesome sound quality and top notch ANC, you won't go wrong with these.

Sony provided a wide variety of options to customise our EQ and DSEE which enables to hear the original sound. Each bits is clear and balanced. Adaptive control enables us to live in the environment we are in. I have used 6hrs continuesly, it's comfort is like breathable water flow not like closed dam. If I didn't bought this, I would have regretted. Thanks headphone zone for your interactive support.

Got these earbuds and before putting them on I wanted to compare them with my Sennheiser MTW2, Oneplus buds pro, and Galaxy Buds pro. I listened to the same music on all 3 and then I put on my XM4s, I was blown away. With just 6mm drivers these create a large sound stage, I don't know how sony did that. Audio quality is top-notch and ANC is best in class, no other tws come close to this. The app is amazing as well with good customization, it captures your ear photo and creates a profile and it really worked well for me. I didn't get to try the 360 audio. If you are an android user and own a high end phone like the S21 Ultra you can really take advantage of the LDAC , I turned on LDAC and could feel the quality get better also I use HiBy for listening to music.

Cons: My only complaint is ear fatigue, I guess this is subjective and depends on each individual, unfortunately, I am unlucky I couldn't enjoy the music for more than 1 hour, my ear starts to hurt and I really have to take them out for few minutes and put it back. I tried all the memory foam tips that came along but couldn't get the right one which doesn't hurt.