ive always had decent luck with them. Seems like every time i go ill hit that call every once in awhile and ill see squirrels and have some luck. The couple of times i didnt have a call with me are the times i got shut out. I think if you use the bark as you are entering the woods it makes the squirrels think you are just a squirrel, and it cuts down on that wait time where you normally sit still and let things get quiet and back to normal.