For quick reads, summary and specs at the end
Now, there is a lot of controversy over what is the best gaming mouse. However, one mouse that I can definitely say is top-tier, with price considered, is the Logitech G900 Chaos Spectrum. It's $69, which might sound expensive for a gaming mouse (you would be right), but this is not just any gaming mouse. It will compete with any mouse on the market in any category- and features some rare traits of its own.
Right out of the box, the mouse is very attractive and features ergonomic, ambidextrous sides that are coated with rubber in the back and use high-quality, smooth plastic in the front to prevent sweaty thumbs. Furthermore, the mouse, for a wireless, is extraordinarily light - at just 107 grams, it's one of the lightest wireless mice out there. The mouse has a tight, crisp click with Logitech's gaming switches, and the metal scroll wheel seems very durable and doesn't wobble. Included in the box is a 6ft long braided micro-usb to usb 3.0 cable. You can use this to make the mouse wired or to charge the mouse.
One of the most notable traits of the G900 is the configurable side buttons. With most gaming mice, you choose your style: you think hotkeys get in the way, so you buy a no side button mouse. You love hotkeys, so you get a MOBA style mouse with 6 hotkeys. Or you're a leftie, which means you have very limited options. Well, the magnetic hotkeys solve all of these problems. You can attach up to 4 side buttons, on two on each side of the mouse. All hotkeys are individually programmable in Logitech Gaming Software (LGS).
As you can see in the left picture, there are three (!) buttons in the center of the mouse. The two triangular ones control DPI (aka sensitivity), and the rectangular big button switches the mouse between scroll and flywheel. What is the difference between scroll wheel and flywheel? Well, if you have a mouse right now, try turning the scroll wheel. You'll feel little increments pass by as the mouse moves. This is good for careful, very controlled scrolling. When you have flywheel on, the mouse does not have those increments. A flywheel will spin as fast as you want it to go. This is great for quickly going through web pages, and especially scrubbing through video. Even though scroll wheel is generally more useful, having the option to instantly switch in between the two is a testament to the G900's exemplary functionality.
Now, let's talk about one of the most important parts of this mouse: it's wireless. Using no batteries, the G900 is charged completely by a micro-usb port in the front of the mouse. It takes ~2 hours to charge the mouse from dead to the full extent of its 24 hour battery life (32 with RGB turned off). The three bars of light below the central DPI buttons tell you the mouse's battery life. The G900 also boasts a 1ms report time, which is important. Human eyes are not attuned enough to sense 1 millisecond differences. This means that to all but the sweatiest eSports gamers, the PMW3366 sensor (adjustable to 12,000 DPI) is the best sensor you'll ever need.
The G900 includes a programmable RBG light zone in the G, an accessory box, and an adapter. This is to plug the dongle into the micro-usb cable if the cable were plugged into your computer. That's particularly convenient if your PC/laptop is under your table. On the bottom of the mouse, you'll find a button that allows you to switch to an onboard profile (You can store up to 5 onboard profiles). This is nice if you're going somewhere where you want your hotkeys but don't want to install LGS. Lastly, the mouse also comes with a removable 10g weight.
Although I've never experienced problems with this mouse, the most common complaint seems to be double clicking. Double clicking is a common, judiciously named issue with mice. When you click once, it registers twice or more times. This is ridiculously annoying and makes the mouse inoperative in gaming, or oftentimes completely useless even for day-to-day tasks. However, these reviews are few and far between, buried in the hoards of 5-stars.
Lastly, the G903. Now, I know this a newer model of the G900. But, there are some significant reasons to choose the G900 instead. The only new feature that came out with the G903 is PowerPlay compatibility. Although PowerPlay is, no doubt, a pretty cool feature (a mousepad that charges your mouse), just the mousepad alone is $120 and therefore quite impractical when there is a minimum 24 hour battery life and you could just charge the mouse with a cord. Additionally, the G903 received significantly worse reviews, with a much bigger cohort of buyers clamoring for Logitech's head after their G903s got the double click problem.
In summary, Logitech's G900 has a plethora of pragmatic features that propel it above competing mice. The extensive wireless battery life, the ability to switch between wireless and wired mode, modular hotkeys, and configurable scroll wheel are all stuffed into an incredibly light package for just $69. If you want a mouse that will be relevant for a long, long time, I would strongly recommend the Logitech G900.
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Battery life: 24 Hours
Shape: True Ambidextrous
OS Compatibility: Mac 10.6+ and Windows 7+
Weight: 107g without weights
RGB: One zone
Sensor: PMW3366 Optical