I will not go to the woods without an Ozonics unit in my pack. When used correctly I am a firm believer they are 100% effective at covering up scent. I have had multiple does and bucks come directly downwind from me multiple times and have not been busted since I have started using one. I will be an Ozonics user for life. Having a Driwash bag and using it prior to each hunt has also been a lifesaver for killing scent and not having to wash my clothes every two weeks. If you are on the line about buying one of these just go ahead and buy it. They're worth their weight in gold!