It would be nice for taking out a raging Trygon or EW model when it pulls off. However, I am just unconvinced of its usefulness. With only 1 shot per turn, its a 66% chance to hit, 50% to wound, the model has to fail their save (likely 2+/3+) and then fail a wounds test (not a T test, my bad). Like I said, alot of rolls. But if it works for you, go for it.