the only problem i see with the therm-a-cell is that it doesnst seem to last long then you have to go out and buy pad refills and fuel cartritdges. if a pad is only good for 2 hours i can see this being a pain to keep changing while on stand.i mean it sounds like the thing works but i just came back from hunting bear in a swamp all week and found getting up a little bit higher in the tree where the breeze is and wearing jeans and a shirt under leafy camo bug suit with a good headnet and cotton gloves does wonders even without spray.