Well, I sure hope it is better than the MX Master 3. For my hands the original – discontinued – MX Master is still the best fit and the MX Master 3 is too small. However, my supply of old MX Masters has started to break down on me at this point and I am growing increasingly worried what the replacement could be.

I'm with you. I loved the original, and tried to go straight to the MX Master 3, but it was too narrow. Ended up getting an MX Master 2S, and the size is comparable to the first, and I love it. This 3S keeps the narrower body shape of the 3, so it won't be an option for me.

Thank you, I will see if I can find one to try out. The MX Vertical has felt pretty nice in my hands too whenever I tried it at a store, but I can not buy a mouse with such an absolutely awful scroll wheel.

I have the MX Master 3 and it's so close to perfection:

1) put the device swap button on easily accessible place along with the device led indicator (perhaps incorporated in the battery led indicator); 2) make it able to work directly via usb cable for redundancy.

That is all.

I wished that when it is unnotched, scrolling would behave like scrolling on a trackpad. It still jumps lines, instead of smoothly moving. The sideway scrolling is awful. No idea how far to scroll before something starts to move.

The mouse is definitely nice to hold, but trackpads still provide a much better scrolling experience. Excel with large row-height is near impossible to navigate without a touch pad in my opinion (and whoever at Microsoft thought it was a good idea to only be able to scroll in whole cells should never work in usability again)

The 3S is supposed to have more quiet clicks, which I consider another improvement.

Hoped for MX Master 4 to be honest