Some will argue that optical sensors are better than five-year-old laser technology, meanwhile, on paper Razer has a leg up on the sensitivity department. Ultimately, though, after using both mice for a week at the same time, we can confidently say they’re both equally as accurate and reliable. Outside of this, the only difference between it and some of Logitech’s cheaper offerings is that the G903 has local memory that lets you save up to five different profiles on the mouse. You can toggle through the various presets manually using a button on the bottom of the mouse. Personally, I’ve never had a need for five presets, and generally limit myself to two: one for office work, one for gaming. But I can see the appeal for more hardcore gamers, who want specific settings for different genres. On plugging the 2.4GHz Lightspeed dongle into a spare USB 3.0 port, the mouse instantly connected. Since then it’s offered an entirely latency-free gaming experience that matches many of the wired sets I’ve tested for responsiveness – and is completely free of the bugs we experienced when testing the competing Razer Mamba + Firefly.

That said, as convenient as the PowerPlay is, it isn’t going to get the Logitech G903 fully charged in a jiffy. Going from 0% battery to a full charge with your mouse on the PowerPlay would take between 12 and 14 hours, by Logitech’s estimate. Performance is an area in which wireless mice have traditionally always fallen behind. They’re generally less responsive and more prone to latency than their cabled brethren. Fortunately, this isn’t an issue at all with the G903 for a few reasons. With this arrangement, the Logitech G903 can pull a constant current of electricity to both power its operation and recharge its internal batteries. Not only that, the PowerPlay mat comes equipped with a wireless receiver that connects with your mouse, so you won’t need to occupy another USB port for a separate dongle – which you can instead plug into a laptop.If money is no object, you’ll struggle to find a better mouse than the Logitech G903. Thanks to the addition of Logitech’s Lightspeed technology, it’s one of the most responsive and reliable wireless mice available. The only lighter option you’ll find is the even more expensive Razer Mamba + Firefly, which uses similar wireless charging tech to let the mouse operate without a battery. It weighs just 96g as a result. Starting with the basics, the G903 comes with up to 11 keys, depending on how you set it up. Out of the box, there are two extras on its left side and an option to add two more to the right using a magnetically attached plastic plug. Second, and more importantly, is the G903’s use of Logitech’s stellar Lightspeed wireless connectivity. Lightspeed is a custom tech designed to offer gamers an insane and unnoticeable 1ms response rate. It’s worked a treat on past products such as the stellar Logitech G613 wireless keyboard, and this remains the case here. The idea here is to let gamers set up the mouse for either their left or right hand – which, as a lefty myself, is very welcome indeed. You may even choose to go all-out, and have four side buttons – although, personally, I think that’s overkill, even if you’re an avid MOBA or ARPG player.

The Logitech G903 might be a wireless gaming mouse, but it feels as seamless as a wired one. That’s no small feat, and that’s all thanks to the same Lightspeed Wireless technology that was also in the G900. We never experienced any latency or loss if signal despite using the peripheral in an office saturated with Wi-Fi, Bluetooth and every other type of wireless signal.Like pretty much every G-series peripheral, the G903 can be customised using Logitech‘s Gaming Software. Once installed, you can adjust the G903’s RGB lighting, sync it across all your other Logitech peripherals, and alter its DPI sensitivity. First is its use of the PMW3366 optical sensor. This isn’t a unique feature, but the sensor is one of the best on the market and means the G903 has a fantastic 200-12,000DPI sensitivity range. The G903’s stellar left- and right-button mechanical pivot hinges round off its performance benefits. The switch mechanism is one of the best around and has a wonderfully light actuation point. This makes the mouse feel insanely responsive and fast.

The battery life performance is where the G502 Lightspeed really establishes its dominance, as it's capable of 60 full hours of usage time if you don't use the RGB light, which is nearly double the G903 Lightspeed's maximum battery life of 32 hours. G502 Lightspeed vs. G903 Lightspeed: Which should you buy? The end result is one of the best mice I’ve tested in performance terms for competitive gaming in quite some time. Up top you’ll find basic buttons to adjust the G903’s DPI, and switch between a smooth or step action on its wheel, plus the usual left and right controls. At the end of the day, I think that the Logitech G502 Lightspeed will be the better choice for most people looking for a high-end wireless gaming mouse. It's true that you have to pay more for it, but the increased optical sensor accuracy, higher DPI range, and more extensive weight-tuning options will very much come in handy if you're looking to take your gaming experience to the next level. The bigger battery life is great, too, as you won't need to worry about charging it very much.