Software

Logitech Gaming Software, or LGS for short, is objectively one of the best mouse drivers out there. All functions can be accessed easily and everything is very intuitive. I found no bugs whatsoever, and there also is no lag when you change a setting. However, the design elements and layout could be a bit better.

The first tab with a little house icon lets you choose between the on-board memory and software-controlled settings. The second page lets you customize the button mapping and pick which side buttons are active. Here, you can access the macro menu as well. The third tab is for the sensor settings, such as setting up the CPI levels and polling rate. You can bind these settings to certain profiles too. As for the fourth tab, it is the one with the lighting controls, more on that below. Next, we have the power consumption, which shows which functions consume how much power. If you lower the polling rate, battery life can increase drastically, so if you want to maximize battery life, I would suggest going as low as 125–250 Hz. Lastly, there is a "heat map" you can activate, and it logs which buttons were pressed how many times during a logging session.

The software takes up 327 MB of disk space and consumes roughly 46 MB of memory while running in the background on my configuration.

Lighting

If you would like some RGB, the Logitech G logo at the back of the mouse lights up depending on your settings, as well as the CPI indicators behind the mouse. The latter only starts lighting up when you change CPI levels, but if you chose that setting, it will synchronize with the logo's effects for when it does.

There are only three main effects for the lighting. The first is a simple static illumination, the second is a breathing effect, and the last is a nice-looking color cycle. You can change the rate of the last two, so they will speed up or slow down accordingly. You can also add the wanted colors in a 255-255-255 RGB color format, besides choosing from a pre-made list. All the effects look nice, and the transitions are smooth, and the lighting itself is very bright on the highest brightness setting. There are three CPI-indicator dots that are very stylishly made. They aren't really visible when the lighting is off, but once it is turned on, they light up as brightly as the back logo, which is pretty impressive.

I made a video in order to demonstrate these effects: