Software – EVGA Unleash RGB
Like all mice, the EVGA X12 has its own software, EVGA Unleash RGB. One small issue I had while trying this product was finding the software through EVGA LATAM (hopefully this has been fixed). The software is quite simple and easy to use. It has six tabs:
-General setting
-DPI (CPI)
-LOD & Calibration
-Lightning Effect
-Key assignment
-Macro Editor
The mouse has up to five different configuration profiles.

In general settings, one can put if you want the mouse to go into sleep/hibernation mode and two options called “Angle Snapping” and “Angle Tune”.
Angle snapping tries to predict mouse movement and smooth the mouse's trajectory. Personally I would not recommend using either of these two options, but the end user can try to see if it really helps in improving their aim.
Also in this tab one can change the polling rate of the mouse, to a maximum of 8000 hertz.

In the DPI tab (which should really be called CPI) one can set the CPI of the mouse and if one wants various CPI levels. The option is self-explanatory.

In calibration, one can configure and let the software recognize the surface that the mouse moves across. I couldn't say if this improves a player's experience, but one is free to try if one finds positive results.
To calibrate, one has to zoom in on a new surface, move the mouse and the software will do the necessary calibration.

The lighting effects tab is quite understandable. The EVGA X12 features three RGB lighting zones that can be configured together or independently. Furthermore, one can choose from different effects, as well as brightness, speed, and playing condition.

In button mapping, one can configure what one wants it to do. For example, in this screenshot, when using the mouse, one accidentally clicks on the side buttons that one does not want and activates them, ruining the experience. Since it's an ambidextrous mouse, I set it to be disabled and not cause any actions I don't want it to perform.

Finally, the macro editor. Those who have used this option before on other brands will find it quite familiar. The macro editor works without a hitch and is highly customizable.
Final analysis and user experience
The EVGA X12 mouse is honestly a mouse with top-of-the-line parts that can be found in many competitive mice. I have to be honest (and it may not apply to everyone) but the mouse is not that much of my devotion. Be careful, there is nothing wrong with the mouse (although its ambidextrous design can be annoying for some). The problem is that after having tried an ultra-light mouse that I use every day, switching to a heavier mouse (14 grams more) is already difficult to get used to again.
Also (it will be age) the wrist hurts less with light mice and that means less muscle/tendon fatigue. Be careful, the mouse is not excessively heavy, since it is only 74 grams. Many probably use heavier mice, so this might be the one for many. The best feature, despite its shape, is that the mouse has all the necessary buttons to be truly an ambidextrous mouse.
For example, one mouse that has good reviews and end-user feedback is the Logitech G502 Hero. That model weighs a lot more than the X12…so many will find the X12's low weight attractive.
I don't see anything wrong with the X12, but honestly it's going to depend on the end user if it's a mouse according to their taste and this highly depends on how they feel when using it. Software-wise, EVGA Unleashed RGB runs smoothly and firmware updates are problem-free.
Another point in its favor is its fairly competitive price in the United States. We don't have a price locally, so it's hard to rate that aspect. In practical terms, the mouse has parts found in top-of-the-line mice, so we have no complaints on that. It would be interesting (at least for me) if EVGA decides to launch an ultra-light mouse (approx 60 grams) with a high-end sensor and a polling rate of 8000 hertz.
It's hard to come to a conclusion, but it will take the end user to test, if the design suits his hand/taste.