Wireless gaming mice is a strange industry. Mostly, it's strange because PC gamers tend to lean toward wired mice on the whole, due to their reliability and to reduce as much input lag as humanly (or machinely) possible. Because of that, a PC gamer typically isn't the kind of person that will go for a wireless mouse, unless their specific tastes outweigh the reputation of wireless mice as a whole, such as really, really hating cables being all up in their business.

Wireless mice are, by and large, picked up for convenience, by people who work or live on their laptops and move around often. Still, though, Logitech keeps trying to make wireless mice that are compatible for gaming—even competitive gaming. The G604 Lightspeed is the manufacturer's latest attempt at this, and honestly, it does a pretty darn good job.

When I grabbed the G604, I was a little skeptical. Logitech has always touted that its Lightspeed wireless technology (which is essentially souped-up Bluetooth to the non-technical) is fast enough to keep up with traditional wired peripherals in gaming. I've used Logitech devices in the past (I gamed on a G602 for over three years), and I knew from experience that the speed just couldn't quite hold up to something on a wire. With Lightspeed, though, the G604 actually holds up, with only a 1ms response time.

I realize that's more of a benefit of Logitech's Lightspeed than the mouse itself, but just know that with that tech, this mouse can actually be used for gaming competitively. And that's good, because that's how I reviewed it. This mouse is being branded as another "gaming mouse" by Logitech, so I'm holding it up to high standards to meet competition from Corsair, Razer, and my personal favorite, SteelSeries. We tried it out with League of Legends, Rainbow Six Siege, Borderlands 3, Destiny 2, and The Division 2.

Here's how it held up.

Physical design

Before we dive into performance, let's talk about how the mouse actually felt, both in my hand and when coasting across my mousepad. It's a lightweight mouse, but it has some satisfying weight to it so that it isn't too lightweight. Unfortunately, all of that satisfying weight is back-loaded, possibly because that's where the single AA battery fits in, making the front end of the mouse feel oddly light. It's only really noticeable when you rotate the mouse, which isn't a common maneuver, but it still does feel strange up near the front of my hand. This doesn't affect how it moves, though, so this is a very minor complaint.

The front continued to get a little stranger the longer I looked at it. It comes to a point between the two primary mouse buttons, which isn't intrisically weird on its own, but it seems like the designer of the mouse just added on extra space to make the point happen. The result is a lot of wasted, empty plastic up at the front of the mouse, about a full inch's worth. I actually bumped the mouse into things a couple of times, just clipping the front, due to the extra length I wasn't used to. I have pretty long fingers and large hands, so this isn't typically a problem for me, which is why it might have felt even stranger. Still, though, another minor complaint.

Like previous mice in the G600 line, this one does include a thumbrest, which I've always liked. This one's a bit smaller than older models, being tucked up against the side of the mouse a bit more, but it's still there enough to feel like I'm actually gripping the mouse with my entire hand. Unlike past models, however, this one comes with a diveted top, clearly inspired by the ever-popular honeycomb mesh mice, which have only grown in prominence over the past couple of years. It isn't a full mesh, though, so there aren't holes, they're just divets down into top of the frame to replicate the same feeling on your hand. It helps with grip, if anything, and does give the mouse a nice modern look.

Performance

The physical design of the mouse can only deviate from the norm so much. It's still a mouse, and it still copies Logitech's basic G600 formula, so there aren't any real surprises there. In-game is where this mouse shines, and why I'd actually pick one up for myself if I was in the market. The Lightspeed tech holds up to its name. I didn't feel a difference in input lag when compared to my wired mouse at home, and I even plugged some more mice in from the studio to compare on the fly, too. It matched them all, and it was smooth while holding up that 1ms response time.

For reference, the Bluetooth-based G602 that I had the most experience with operated on around 10-11ms. That's what most Bluetooth-based devices operate with, too, which is where the "Wireless isn't good for gaming" reputation comes from for PC peripherals. A single millisecond, however, is on par with, or even better than, top competitive wired mice. The default DPI levels were a little wonky, but that was easily remedied by adjusting them within Logitech's G HUB software, which we'll talk a little more about later.

My biggest concern when reading about the mouse using Lightspeed tech before I actually used it was its battery life. Without a chargeable battery, and only operating on a single AA battery (very reminiscent to the G602), I was worried the Lightspeed would burn through the device's power. Well, it turns out.. it does, but not enough to be a problem. Using Lightspeed, you still get a solid 200-ish hours of uptime, which is maximized by the mouse putting itself to sleep if you forget to turn it off and leave your desk. On Bluetooth, which you can switch back to with the flip of a switch, it can run for five months without needing a new battery. But if you're gaming, you definitely want to use Lightspeed. 

One of the big draws for me before actually picking up the G604, as someone who plays a lot of MOBAs and other games with hotkeys, was its six programmable side buttons. Any gaming mouse with a few side buttons scores immediate brownie points with me, because I know I'll use them. At home, I use the Corsair Scimitar, which has 12—a necessity for the various MMORPGs I play. Six buttons, however, is perfect for MOBAs. I bound three to my item hotkeys (1, 2, and 3 respectively) and the other three to my trinket key, the item shop, and the scoreboard.

After playing a few hours with them, those buttons turned into the biggest weakness of the mouse. They're too stiff, and when I needed to force them in just to get them to click, that messed up the trajectory of my mouse or even caused it to move and shake a bit. That led to vital missteps in some high intensity games. Because of that stiffness, I had to move the three hotkeys, which I use in the middle of fights, off of the mouse. The trinket, scoreboard, and shop were fine, as you don't use those in fights all that much, at least not the shop and scoreboard. The side buttons are very wide, too, so instead of being able to simply lean my thumb forward and back to reach the front and rear buttons, I had to physically move my thumb off of its rest, which can also cause some mistakes. If you don't use side buttons on mice, this won't be a big deal to you, but for those that do, be weary.

Software

The mouse's software is a major, major win. I'd pair it up with its speed in terms of its biggest strengths. G HUB, which is Logitech's management software for most of its newer peripherals, is pretty straightforward. It shows you which Logitech devices are plugged in and allows you to, well, manage them. For a keyboard, that can mean anything from macros to RGB. For the G604 mouse, it meant all the essential mouse-stuff I could think of. DPI, button mapping, you name it.

For DPI, you get four profiles, all of which are customizeable. As you'd imagine, it starts off really slow, and ramps up to way-too-fast. Neither of the middle options, being 800 and 1800, felt right to me, so I shifted the 1800 profile down to 1500, and it felt perfect thereafter. For button mapping, the world is your oyster. You can assign simple keyboard keys to a button, full macros, and even, and this one was the surprising one to me, applications.

With a button press, I can launch a game, open Chrome, or even open G HUB. If you've used either Razer or Corsair's equivalent software, this functionality isn't strange to you, but trust me when I say, Logitech's version is way easier to use, and it isn't even close. I've been using Corsair's iCUE for years, and I still hate how convoluted and needlessly complicated it is just to do simple functions. G HUB doesn't have that problem to an extreme. It's really quite innovative, and if you do have a Logitech peripheral, don't neglect yourself by thinking you don't need it.