Tried the same thing allready, with mixed results.
Depends on your opponent and wheather or not you can trigger their trait.
Was quite successful against death guard, with multiple small squads (nurglings, cultists, plaguebearer and zombies), so I triggered it 4 or 5 times per game. If you're running against something like knights, Custodes or daemons with large blobs it's nearly impossible to trigger and get use from it at all.
But especially in large games, with 2000 points and upwards the trait becomes better and better. Must be brutal in an Apocalypse game.
Personally I prefer running my shooty orks as bad moons, since they profit from their trait all the time.
Exception would be an freebooterz detachment with mekgunz and maybe one squad of dakkaboys, since the guns don't profit anyway and the boys are great for killing cheap chaff. Also the flash gitz can use their trait inside a waggon, which is nice.