Overview
UMP 45's Mod I upgrade improves upon all the aspects that already made her good, with better multipliers on her Tiles and Skill 1. Her overall use case remains the same as her non-mod version.
Her Mod II however is sadly not very useful, causing minor damage to enemies that attack inside her Smoke Grenade, and leaving her at Mod I is recommended.
Her Mod III equipment is a slightly stronger Suppressor and is at best optional.