How do you improve on perfection? It's not a word that you tend to use often as a tech reviewer, but I think most right-handed users tend to agree that the Logitech MX Master 3S is pretty close to perfection, and it's been the mouse I use for work since its release day a few years ago.
Now, though, after a longer gap than it's left for ages, Logitech is bringing out the MX Master 4, and you can pretty clearly tell from looking at it that there was a lot that had to stay the same. I first got my hands on the MX Master 4 at IFA 2025 in Berlin, behind closed doors, but I've also now been using it every day for over a week, and it's a seriously impressive bit of productivity kit, mostly for what it keeps the same rather than what it changes.
