I bought one last season and used it sparingly with little to no success, but I broke it out this past Saturday and had a buck come in on a string less than 3 minutes after hitting it. He stopped 15 yards from my stand and started looking around for the source. Too bad for him...fresh meat.
I think a deer has to be in the "mood" to respond to any call and I just called to this one at the right time. At any rate, I think deer are more likely not to pay attention to it than run away from it, so it probably wouldn't hurt, just in case Mr. B&C is in the mood!

Rack