I have always just poured doe urine on a drag rag and then hung it in a tree after trailing in. Am I missing out on something with the heat gimmick?
I particularly evening hunt I was on the ground between the woods and corn field and had it out with the scent carrying into the corn. After a while, I could hear deer moving through the corn and out comes a decent 8pt who stuck is nose right to the bottle.
My opinion on scents in general these days is that it's a 50/50 proposition. I haven't bought scent now in a couple years if that tells you anything. However I have an active food plot with 3 scrapes under a single tree that I may get some scent for this year.
What ever the amount of money you are planning on spending this season just send it to me. I will send you a letter with my personal guarantee that you will see and kill just as many deer with my letter in your pocket instead of using snake oils.