The Logitech Signature Comfort Plus M850 L ($49.99) is a productivity mouse built for long days at your desk. The M850 L features a sculpted body and rubber grips for added comfort, but what sets it apart from similarly priced mice is a palm cushion built into the top of the mouse shell. It looks supremely plush, but in practice, the ergonomic benefit is negligible. That, and a few other quibbles, add up to a mouse that's palatable enough but not as compelling as Logitech's own, excellent Signature AI Edition M750 Wireless Mouse.

Design: A Simple Design With a Shortcut Superpower

The M850 L is a familiar-looking mouse, with no array of buttons, lights, or anything else you might find on a gaming or high-end productivity clicker to distract from a clean, simple design. While it’s smaller than my primary daily driver, the Logitech MX Master 4, the M850 L fits comfortably in my right hand, though I would be lying if I said I didn’t miss the MX Master 4’s subtle wing that holds my right thumb. Still, the mouse is well-sculpted for users with large hands—hence the "L" in the name. For my moderately large hands, it feels nearly perfect. The rubberized ridges on the mouse’s left and right sides offer a sturdy, comfortable grip. Two extra buttons are positioned on the mouse’s left flank, easily accessible by my thumb.

(Credit: Zackery Cuevas)

The M850 L measures 1.7 by 2.9 by 4.8 inches (HWD), making it smaller than the HP Ultra-Fast Scroll Wireless Mouse 780M. It weighs 3.8 ounces with the AA battery and 2.9 ounces without it (more on the battery situation below). It closely resembles the M750's shape, though it's much larger. The slightly slanted left- and right-clickers are silent when pressed, and the scroll wheel is as precise as it is satisfying to use. While it pales in comparison to the magnetic scroll wheel of the MX Master 4, it’s still quite reliable.

Just south of the scroll wheel, you’ll find an extra button. On a gaming mouse, this would be your designated DPI button, which changes pointer speed on the fly, but the M850 L packs something arguably better for productivity: a trigger for Logitech's Actions Ring. The Actions Ring is essentially a digital overview of shortcuts that you can pull up at the press of the button. Once the Actions Ring is on the screen, you simply navigate your mouse to the option you want.

(Credit: Logitech)

The beauty of the Actions Ring is that it can be customized per app. It’s especially useful for CAD workflows, as it essentially moves frequently used shortcuts into the digital overlay for quick access. It’s a powerful tool for productivity.

But as powerful as the Actions Ring feature is, it also highlights my first issue with the mouse: The Actions Ring button is too close to the scroll wheel. It’s not necessarily invasive, but almost every time I flick the scroll wheel, my finger runs up against the button. It feels a bit like I’m picking at a scab, as the button protrudes slightly from the mouse and isn't flush with it, unlike the similar button on the MX Master 4.

(Credit: Zackery Cuevas)

Ergonomics: Not as Plush As It Looks

I imagine the Actions Ring button was pushed up slightly to make room for the main attraction, the palm cushion at the center of the mouse. The idea is that you can rest the palm of your hand on this soft bit of mouse, a brief respite in your long, hard day of clicking around the internet.

But in use, it’s not really that comfortable. I wouldn’t call it plush; it’s about as comfortable as the basic wrist rest on the Logitech Wave Keys. I’d never say no to a wrist rest, but I felt like I didn’t really notice a handfeel difference when jumping between this and my MX Master 4. Most of the time, while I was using the mouse, my hand barely grazed the cushion. Perhaps it's better for those who use a flatter palm-style grip when operating a mouse, but no matter what grip I used, I just didn't feel any more (or less) comfortable. You may appreciate the cushion after, say, 12 hours of straight computer use, but as it stands, the benefit was lost on me.

(Credit: Zackery Cuevas)

So what else is there to showcase? Flipping over the mouse reveals two PTFE feet that don’t provide the smoothest glide. In fact, mousing around feels choppy with the M850. I used it on both my mouse pad and a plain tabletop, and they felt mostly the same to me—a little rougher than expected. You’ll also find the battery door here that houses the mouse's single AA battery. The M850 doesn’t use a rechargeable battery; Logitech says that one AA battery will provide up to two years of power.

Software: Logi Options Saves the Day

I'm a little disappointed by the build, but the mouse's saving grace is that it's still packed with software functionality. Downloading the Logi Options+ utility lets you edit the Actions Ring settings, as well as build shortcuts in Smart Actions, Logitech’s macro maker meant to automate tasks. Here you can also customize Logitech’s AI Prompt Builder, which helps you craft AI-generated messages with specific parameters (called "recipes"). These settings (including Actions Ring) are not enabled by default and must be turned on in Logi Options.

(Credit: Logitech)

The M850 L connects only over Bluetooth. The wireless pairing lets you jump easily among three Bluetooth-enabled devices; the mouse's wireless is not compatible, though, with the Logi Bolt wireless standard or Logitech’s 2.4GHz USB receiver. (Logitech sells a "for business" version of the mouse that supports Logi Bolt for an extra $10.) In true Logitech fashion, the mouse is platform-agnostic, compatible with Android OS 12.0 or later, ChromeOS, Linux, iPadOS 15 or later, macOS 12 or later, and Windows 10 or later.

You can buy the mouse alone or in a bundle with a keyboard, if you're in the market for both. Called the Signature Comfort Plus Combo (MK880), the bundle will net you the M850 and a full-size Bluetooth keyboard, called the Logi K880, that features a foam wrist rest, surprisingly deep, cushioned keys, and three years of battery life on two AAA batteries. The keyboard cannot be purchased separately—it's available only in the bundle.

(Credit: Zackery Cuevas)

I actually like the keyboard a lot, and I would even say it's very similar to the Wave Keys (without that keyboard's signature wavy body). The combo retails for $99, while the business version retails for $109 and adds Logi Bolt support and Logitech Sync device management for IT professionals.