I've been using the Logitech MX Master 3S as my exclusive productivity mouse for the past two years. It's become something of an old friend at this point, so I was anxious to test out its successor, the Logitech MX Master 4. This new model promises many improvements over its older sibling, but sitting the two next to each other reveals a surprising number of design-based differences I wasn't expecting.
The MX Master 4 is taller at its peak, for a start. It's also a touch longer, a touch chonkier, and now comes with a substantial rounded ridge along the left side where the horizontal scroll wheel resides. The main buttons feel different, too, as they're now nestled inside a semi-translucent coating that strikes as one of the more bizarre additions I could think of adding to a mouse redesign.
