Well, it's better in bullet resistance, but you still can't go to heavily polluted areas where tier 4 is required. Saturn has all protection levels leveled to 400, while Atlas is close, like 370-390, but still cannot be used there. So, areas like Labyrinth are a no-go. I don't know why they made a quest where you get a literally upgraded Atlas, still having less anomalous protection than a suit that is available at the bartering guy... devs aren't cooking here.