APH has one calling card, it's a ballistic weapons that sticks to Adamantite Alloys in 40% of angles. That's good enough to give it a place in the end game as an edge case weapon to penetrate Disruptors and Meson Shields. Relative to all other large weapons in damage, range, or accuracy, it's not bad, but specific weapons will outperform it in any given area. Unlike its Heavy Driver cousin's noticable kinetic push, the APH has no non-damage function in combat.
APHs will ricochet off of ships with one of the four armors, but ricochets will still impart kinetic force. All APH damage will be completely negated by Grav Shields, and Shield Projectors, but shouldn't be affected by Deflectors.