I bought some Scent Killer back in '93 on a whim, and found that it worked better than I ever expected.
I had been invited by my friend to hunt his in-laws place in TX on the Pease river.I had never been there before, it was dark, and I had no idea where the stand was. He told me I'd see the reflective tacks as I went down the trail with my flashlight. He didn't mention that I had to shine the light kinda back behind me at a certain point to see the reflectors. I didn't find the stand until it started to get light out. Disgusted, I was gonna head back to the car, but figured I might as well sit in the stand for a couple of hours cause I didn't want to go trudging back through the place and maybe spook deer that the others might have a chance at getting. So I climbed up and sat there thinking I was in for a long boring sit. Boy was I wrong! I hadn't sat there for 30 minutes before I heard the unmistakable footsteps of deer behind me. It turned out to be three does, who were heading my way and passed directly under me.They came up the exact same way that I had come, and seemed completely unawares of my presence. I was only about 8 feet up in a tree that was bowed over,and my feet were hanging down only a couple of feet over their backs. I figured when they got downwind they would spook but, they never did. Nor did they show any signs of being alarmed at all. I had never been that close to a deer in my life. It was great, except for the fact that Wilbarger Co. TX (in those days) was buck only for archery season. So I just watched em as they fed along until they got out of sight. I also had a little fork horn come along within 15 yds that morning, only he wouldn't come completely out of the brush for a clear shot. He also got downwind of me unawares. I even got to watch him work over a few small saplings on his way through.
I wrote all that just to say that, even though I was skeptical at first about the scent killer, I became a "believer" that day. I didn't get a shot ,but getting close enough to deer to count the hairs on their back(especially since I thought I blew it) was a successful hunt in my book.