The Alex is a suit with a number of traits that can make it usable if you play into them such as the combination of high base movement speed, it's small body and a shield making it somewhat hard to hit depending on what s attacking it as well as being able to avoid a lot of damage from certain configurations of funnel attacks, that said you can't inflict a lot of damage quickly putting you at a noticeable disadvantage in any damage race.
Parts used Special leg armour lv3, Overtuning (Beam Armour) Lv1, Anti-Melee Armour Lv3, New Model Frame Lv1, Enhanced Firing Program Lv4 + Lv1, Composite Frame [Type-A] Lv1, High Spec Cruise Control Lv1
Other notes: Alex Beam Rifle is only Lv3 so slight damage loss on that.