Logitech MX Master 3S Review

MagSpeed Electromagnetic Scroll Wheel

The MagSpeed scroll wheel is the MX Master 3S's defining feature and the reason most power users buy it. Unlike traditional scroll wheels with physical detents, MagSpeed uses electromagnetic resistance — letting you switch between precise click-to-click mode (for line-by-line navigation) and frictionless hyper-fast mode (for flying through 1,000-row spreadsheets in under a second). The transition is automatic: scroll slowly and it clicks; scroll fast and it goes frictionless. In practice, scrolling through a 200-page PDF or a complex codebase feels fundamentally different from any other mouse. The wheel is also near-silent, matching the quieter main buttons.

Logitech Flow: The Killer Feature for Multi-Device Users

Logitech Flow is software magic that lets the MX Master 3S control up to 3 computers simultaneously — you simply move the cursor to the edge of one screen and it jumps to the next machine. More impressively, it supports cross-computer copy-paste: copy text or an image on your Windows PC, move to your MacBook, and paste. This is transformative for users who run a laptop alongside a desktop or who switch between personal and work machines. Setup takes about 5 minutes via Logi Options+ software. Flow works over both Bluetooth and the USB receiver (Logi Bolt), meaning it functions even without a shared network.

Ergonomics and Build Quality

The MX Master 3S follows the same sculpted right-hand-only form factor as its predecessors, with a natural arch that supports the palm and a dedicated thumb rest. The silicone thumb grip provides purchase without becoming sticky over time. At 141g it has a satisfying heft without causing fatigue. The near-silent main buttons use a redesigned switch mechanism that reduces click noise by 90% compared to the MX Master 3 while maintaining the same tactile feedback — a genuinely noticeable improvement in open-plan offices. The side thumb wheel adds horizontal scrolling in spreadsheets and timeline scrubbing in video editors, a feature that sounds gimmicky but becomes indispensable after a week of use.

Sensor Performance and Battery Life

The new 8,000 DPI sensor tracks accurately on glass desks and virtually all surfaces — a real improvement over the 4,000 DPI sensor in the MX Master 3. For most productivity users the DPI ceiling matters less than tracking consistency, and the MX Master 3S delivers: no jitter, no acceleration artifacts, and stable performance on cloth pads, wooden desks, and stone surfaces alike. Battery life is rated at 70 days on a full charge via USB-C, and in practice this holds up — a 5-minute USB-C charge gives 3 hours of use for emergencies. The mouse connects via Logi Bolt USB receiver or Bluetooth, with the Easy-Switch button toggling between up to 3 paired devices.

Logi Options+ Software

Logi Options+ replaces the older Options software and is a significant improvement. Button remapping is deep: every button (including the thumb wheel and gesture button) can be assigned app-specific actions. The gesture button + mouse movement combination is particularly powerful — swipe left/right to switch desktops, up to open Mission Control on Mac, down to show the desktop. You can create per-app profiles, so the thumb wheel scrubs the timeline in Premiere Pro but zooms in Excel. The software is available for macOS and Windows; Linux users can use Logitech's open-source Solaar tool for basic configuration.

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