This is definitely a good upgrade from MDR-1000X to the mark 4. Pretty balanced lows, and highs. It attempts to upscale the audios to HiFi and does a good job at it. The Sony Headphone app is required to fine-tune the headphones according to your liking. The noise-canceling is best in class. You can adjust the noise-canceling pressure from the app if the defaults are not your thing One more good thing about these is the ability to connect to 2 devices simultaneously. The experience is pretty seamless, but only one device can play at a time. If you're connected to a laptop and a phone and listening to audio from the laptop and the phone rings, you'll have to stop the audio from the laptop, and then only you can answer the call. The call quality is good too. Never heard anyone on the other end complain about the voice quality. Battery life is awesome. I usually use them for 4 hrs per day and I managed to drain them out only once. The USB Type-C interface is good to have so now I have to carry only one cable. The headphones are lightweight and you can wear them for hours.

Very good headset.. but there is a Hiss sound in left ear cup

Great product and excellent service. Quick delivery and great value for money.

Excellent customer service and timely delivery. The support staff was very accomodating and the product itself had no issues at all

Great it was worth it