Pro X has a wow factor to it. It looks stunning or at least interesting, if you are not a Transformers fan. Build is of a superior quality. I play LoL, so I opted for optical PixArt® PMW3310 sensor. It is precise and I feel very much in control. Simply put, I never owned anything close to it. There are however a few important downsides. First, despite all customizations mouse does not fit my large hands as Rat 9 does. Thumb buttons are of a lesser quality. Those buttons feel plastic, cheap and the presses are unreliable as there is no click feeling to it. Moreover, as the mouse is so light and the friction so diminished, when you press one of those buttons you tend to move the whole mouse because of how light it is. That is a very undesirable effect in the game. I recommend you test it before you buy it.