I have seen it work and I have seen deer completely ignore it. Until Evercalm came around I always had a bottle of something with me. Black Widow scents, literally have scared the shit out every deer that came in contact with it. I have a line on a guy that makes his own scents, the stuff looks like bottles vomit but it is absolutely the best stuff I have used. The smell.....it is absolutely putrid! I honestly think it is timing, just like rattling and using calls. Sometimes you get a decent response, other times a big buck shows up. I dont go in the woods without Evercalm though.
I will give an example of timing, last season, my buddy tagged out and decided to sit with me and maybe get some video. The other guy in our group left a Buck bomb sitting on the porch. We made a joke and I grabbed it, got to my stand and I let it off on a dead fall. 2 hours later one of the biggest bucks I have ever had a chance at shows up at 36 yds and knocked the can off of the tree. Timing was right, had the right deer close to my location. Not convinced it was the buck bomb but it was amazing to watch him literally walk right to the can.