Handling is about average for the SMG category. The MX9 has no particular strengths or weaknesses in regard to reload time, raise time, or ADS time. The 35 rounds in the magazine can be expended rather quickly due to the high RPM, so spraying is not recommended unless as a last resort option. As such, the MX9 can struggle in prolonged gunfights, especially when taking on two or more enemies at a time. The iron sights are mostly fine for close-range engagements, but some users may find them cluttered, so the Reflex is recommended to improve usability.
The Quickdraw and Grip are strong choices, and both improve the MX9’s ability to consistently win engagements. However, the AP Rounds and High Caliber fulfill more niche roles that aren’t nearly as useful. In the case of the AP Rounds, submachine guns already have low base damage against vehicles and equipment, and other weapons, like assault rifles or light machine guns, are much better suited to an anti-armor role. In the case of High Caliber, the attachment is entirely dependent upon the user’s ability to land headshots, and as accuracy is not the MX9’s strength, the attachment is not as useful as on other, more accurate weapons.