I used them for bear hunting. Really no way to really tell if they work or not over bait.
When I first got mine. I put it in the corner in the house and to test it I turned it on, then put a hotdog behind it to see how my basset hounds reacted. If you know bassets you know they can smell hotdogs miles away.
They paid no attention, like it wasnt there. I turned it off, and bam, they had the hotdog gone in a pair of seconds.
It would've been nice to have when I had a 4x4 bull elk at 4.5 yds this year during early archery. Too bad I didn't have a bull tag. Once it walked around me and got about 8 yards downwind it caught my scent and bolted. I was trying to get my cellphone out and get a video of it but it was already gone.
First hand of experience, I was filming a whitetail archery hunt for my brother-in-law last year with one of these over top of both of us. He’s a sponsored hunter that’s had articles/pics in field and stream and all that so he got and uses a free one. Beer and chili dinner from the night before starts workin’ 2 feet from my face and I never would have known if I didn’t hear it. I just hunt with the wind so I can’t bring myself to buy one, but if I got a free one it would get used every time I went out.