Anecdotally I am noticing a difference in my drops. Sometimes I'll go through some dry periods and then all of a sudden there will be 5 heavy boxes on the ground, which is sort of a waste sometimes if I need to move, overall I can say I consistently notice more heavy ammo drops.
And if that is not enough, replenishing more heavy ammo per drop is also great. 1 drop gives 3 Ghallarhorn rockets, that's quite amazing. Plus, no heavy ammo bug like Armamentarium.
And lastly, they look fucking amazing with the new fur collar Vanguard chest piece. I'll probably try an Orb Factory Defender Build tonight in the raid with Corrective Measure, I'll report my findings.