So i bought one and tried an experiment with it. I cooked a juicy steak and put it on a small table outside at the base of a tree. I had a box fan and had it blow air on the steak in the same direction the wind was blowing. I setup the ozone above it. Then I brought me dog outside and got her to walk down wind about 40ish yards from the steak.
Once she crossed the scent stream, she sniffed the air like crazy (put her nose up with her head back), but didnt look at the steak. It was like she smelled steak but wasn't sure exactly where it was coming. I let her just wonder and after a few seconds she started walking around sniffing the ground and air. Took her maybe 20-30seconds if I remember to find the steak.
I tried the experiment again later that day in a different spot and without the ozonics. As soon as she was down wind of the steak, she sniffed the air same as earlier, but then made a b-line to it.
This isnt a perfect experiment, my dog could have easily known the second time that theres a steak on a plate for me when my human walks me through the yard like this. Either way, she smelled the steak regardless of the ozone machine. But it did seem like it delayed her pin pointing it.
I ended up hunting with it a season, and had one encounter where I actually had deer in range to see it work. A group of does were walking along a trail and stopped down wind of me. they smelled me but not the same as if I didnt have the ozone. They looked all over and even up the tree right at me. Took 10 mins for them to finally turn back.
So thats my experience. Dont think it eliminates all scent but it seems to throw critters off a bit. I doubt it would work on a cagey old buck as they are less tolerent of human scent than does. Ive seen does scent me or other hunters and stop for a bit and either try to find the hunter or stomp and snort a bit before running. But big bucks When they catch your scent I have always witnessed them freeze for a split second and turn and bolt, sometimes they snort but most I find don’t. Either way, they do not pause and assess, the peace out quick.
So take all that for what it’s worth to you. I sold mine more cause it was just another piece of gear I had o deal with. I actually didn't think it was that noisy. The fan is just a dull hum.