Marquette,
I have used them for the last 5 seasons and wouldn't go into the woods without it now. Where we hunt, archery comes in August 15th with 95 degree weather and mosquitoesas big asdragon flies. We tried everything including Shannon's Bugtamer, it worked to keep them from biting but the mosquitoes were so loud buzzing around your head that it was impossible to hear deer coming. Now, just I turn the thermacell on 10 minutes before I get to the stand (to warm it up) and hunt in shorts and a t-shirt. Granted, I try to cover up my white legs. I have had deer as close as under my stand and they did not spook from the smell (but I try to climb at least 25 feet so that might have something to do with it).