Ignore the orb socketed into its left side, and the Logitech MX Ergo S looks a lot like an oversize mouse. Your hand sits on the matte-grey shell in the same way, except with your thumb resting over the glossy trackball and your wrist canted slightly to one side. You can also pivot the whole mouse body to change whether your thumb lies parallel with, or partly perpendicular to, your working surface.
(Credit: Joseph Maldonado)
The entire assembly is held securely on your desk by a hefty aluminum “foot” with a rubber base, which allows for the pivot. Logitech also offers a version of the device called the Ergo S Plus that bundles a large, fixed wedge in the box; the wedge can replace the aluminum base, adding an extra 10 degrees to the trackball’s 20-degree tilt. This puts your hand even closer to perpendicular to the desk.
(Credit: Joseph Maldonado)
By itself, the Ergo S weighs 5.8 ounces and measures 2 by 3.9 by 5.2 inches (HWD), while the aluminum base adds roughly 3.2 ounces to the total. You can pair the Ergo S with up to two devices via Bluetooth; you switch between them via the “1, 2” button south of the scroll wheel. Alternatively, you can connect the Ergo S to your computer via the included Logi Bolt wireless USB receiver. This 2.4GHz dongle—which occupies a single USB Type-A port on your host computer—can be shared with other, Bolt-compatible Logitech peripherals.
(Credit: Joseph Maldonado)
The layout of the Ergo S features the pair of main left/right click buttons, a tilting scroll wheel, and two slim, raised buttons that sit to the left of your index finger, in addition to a single small button that you’d trigger with your thumb, placed slightly above the trackball. All of the auxiliary inputs respond with a distinct click, but the two main buttons are almost silent, similar to Logitech’s MX Anywhere 3S—and appreciated for anyone working in a crowded office. The trackball itself uses a 2,048-dot-per-inch (dpi) sensor and is easy to pop out for cleaning the ball and its socket.
(Credit: Joseph Maldonado)
The scroll wheel on the Ergo S can pan left or right by nudging it in either direction, but it lacks the quick-scroll feature found on Logitech’s MX Master lineup. Beyond this small omission, I don’t have any issues with the Ergo S’s design. The weight might be a problem for someone who prioritizes portability, but personally, I appreciate the extra heft that helps keep the Ergo S from sliding on your desk.
