Of course, it is worth writing about the differences with the WH1000XM3 model (there was an experience of using it), because they are. - The quality of the materials has become even better, very pleasant to the touch - Added features that I described in the merits (especially cool - chat mode, you can not remove the headphones, but just start talking) - In the previous model, I was uncomfortable with a pressing sensation on the membranes. Just in case, I compared both models in the store - indeed, this problem was eliminated in XM4 - Louder, richer bass, noise reduction on the same or slightly better Is it worth it to pay extra for a new model? I had doubts, but after a week of use, my doubts disappeared, and I realized that I made the right choice by buying the XM4.