Might be effective in making you drop your gun and run away. Job done.
Yeah, I guess it's the biggest strength is the psychological effect. This sound combined with the quite powerful punch which it has can be devastating to morale. This weapon reminds me quite a lot of German Nebelwerfer from WW2. Probably because it sounds pretty much the same. https://www.youtube.com/watch?v=FqHuOMFZKCo