Aesthetically, the M575S isn’t terribly different from its more expensive counterpart, the MX Ergo S. Its 1.9-by-3.9-by-5.2-inch (HWD) shell curves inward to fit right-handed users (sorry, southpaws), and is canted about 5 degrees off your desk to help prevent wrist strain. However, the M575S’s shell lacks the MX Ergo S’s grippy texture and additional tilting options.
(Credit: Joseph Maldonado)
The M575S also copies the MX Ergo S’s layout. A pair of additional buttons sits to the left side of your index finger, and a simple textured scroll wheel splits the main inputs. Unlike its fancier version, the M575S lacks directional tilt-scrolling for its scroll wheel, and it doesn’t have the extra single thumb button above its trackball.
(Credit: Joseph Maldonado)
The M575S has one small advantage over the Ergo S, though: its possible color palette. Instead of the default matte gray, the M575S offers five shell-and-trackball combinations to choose from. While your options are limited to blue, white, black, or gray, it made me wish the Ergo S had similar customization choices.
(Credit: Joseph Maldonado)
As for the power source, the M575S runs on a single AA battery and doesn’t offer wired use or USB-C charging. The device pairs with your device via Bluetooth or the Logi Bolt unifying USB-C receiver, which can be shared with some new Logitech peripherals to provide 2.4GHz radio-frequency (RF) connectivity.
I lament any accessory that uses disposable batteries or ergonomic devices that lack adjustment options. But on the flip side? Less heft. The M575S is about half the weight of the MX Ergo S, and light enough to be considered portable, provided you don’t mind the bulk of a trackball stuffed in your backpack.
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