Logitech - MX Master 4 Wireless Laser Ergonomic Mouse with Advanced Performance Haptic Feedback - Wireless - Pale Gray

What’s Great (Strengths & Features) • Excellent Ergonomics & Build • Very comfortable sculpted design for right-handed users; great for long work sessions. • Premium build: smooth feet, sturdy feel, improved coating that lasts longer. • Quiet-click buttons make it ideal for office or shared spaces. • High Precision & Smart Scrolling • 8,000 DPI sensor tracks on almost any surface — even glass. • MagSpeed wheel switches between precise steps and fast free-spin scrolling. • Multiple customizable buttons + horizontal thumb wheel → huge productivity boost. • New Haptic Feedback + Action Ring • Built-in haptics give subtle vibration cues for actions, scrolls & shortcuts. • Fully customizable or can be turned off. • “Action Ring” overlay lets you pull up app-specific shortcuts with tactile confirmation. • Strong, reliable wireless performance + USB-C receiver. • Excellent battery life (up to ~70 days). • Great for Productivity & Multi-Device Workflows • Perfect for coding, editing, spreadsheets, design, and multitasking. • Smooth device switching (up to 3 devices) via Easy-Switch or Action Ring. • Broad Compatibility • Works with Windows, macOS, Linux, ChromeOS, and even iPadOS via Bluetooth. • Supports Bluetooth LE and the included USB-C Logi Bolt receiver. • Ideal for people using PCs, Macs, tablets, and modern USB-C laptops. What’s Not Great (Cons & Limitations) • Size & Handedness • Large, right-handed shape — not ideal for small hands or left-handed users. • Heavier than travel mice; meant for desktop use, not portability. • Haptics Are Hit-or-Miss • Limited app support so far. • Many users may find it cool but not essential. • Not for Gaming • 125 Hz polling rate feels slow for fast/competitive games. • Some note slightly slower response than older MX models under fast movement. • Missing Convenience Features • No onboard memory for profiles — settings tied to software. • No storage slot for the Bolt receiver (easy to lose during travel). • Premium Price • ~$120–$130 is expensive. • Upgrade from MX Master 3S is noticeable but not huge unless you want haptics & USB-C dongle. Who Should Buy It • Professionals who work long hours on a computer. • Developers, editors, designers, analysts, and heavy productivity users. • People who work across multiple devices (PC, Mac, iPad, laptop). • Anyone who wants comfort + tons of customization. Who Should Skip It • Left-handed or small-handed users. • Gamers looking for high polling rates. • Travelers needing a compact mouse. • Users who don’t care about shortcuts, haptics, or customization.

Writing this review after using it for a month now: Connectivity is noticeably more stable via the Logi Bolt receiver compared to Bluetooth, with consistent performance and no observable input lag during extended usage. Customization through Logi Options+ unlocks the true potential of the MX 4, offering extensive button mapping and application specific controls that significantly improve workflow efficiency. What really stands out is the high-accuracy optical sensor with adjustable DPI (up to 8,000 DPI). It provides precise and controlled cursor movement, making it well suited for long hours of technical work such as software development. The ergonomic design helps reduce fatigue during extended coding sessions after using for more than 2 weeks. The MagSpeed scroll wheel adds substantial value, especially when navigating large datasets, long code files, or massive drum arrangements during music production. The seamless transition between precision scrolling and free spin mode makes timeline navigation fast and effortless. After using it for more than 4 weeks, the only downside is the weight of the MX 4, which may feel slightly heavy for users who prefer lighter mice or make frequent, rapid movements. However, this trade-off also contributes to its premium build and stability.

I switched from the Razer Basilisk V3 Pro to this mouse looking for an ergonomic improvement to reduce wrist fatigue and this mouse does not disappoint, the addition of the side scroll button and the haptic button have been a game changer for me in terms of productivity and saving time during work hours. The battery is a huge jump compared to the Basilisk's battery (taking into account that this mouse does not have RGB like the Basilisk) if what you are looking for is to optimize your productivity and more importantly take care of the health of your wrist, this is the way to go.

This is, without a doubt, the best all-purpose computer mouse you can spend your money on. I came from an MX Master 2 - I never planned to upgrade until it was stolen. The thought of spending $100+ on a new peripheral was a hard pill to swallow, especially when my Master 2 worked perfectly. However, I knew I had to stay with the Master series. Let me just say, the upgrade the Master 4 is incredible. The haptics are perfect, the software is excellent, and I now find myself thankful that I had a legitimate reason to upgrade. The software can be a little tricky to set up, but find a good guide on line and you will see your productivity increase within a day. Huge note: if you plan to use this at your job, please make sure your company allowed for the Logi Options software to be downloaded to your work computer. This mouse does not carry the settings on onboard memory. That's where the magic happens.

It’s larger than the 3 and I think it fits better in the hand the haptic feed back is a nice touch the programmable option far exceed the 3 overall its a nice upgrade!