Depends on whether it's a "levers and buttons" mech, mo-cap, or direct neural interface.
It's "use magic device" - knowledge of how to make this work requires knowing how to power it at least. It's arcane lore, sufficiently advanced technology indistinguishable from magic.
But in terms of movement, I think it's definitely heavy armor. Interfering with class abilities like such for many classes.
but only with the hatch down
