I have used Thermacells since they came out. I spot and stalk hogs with them 12 months a year...even if the wind is blowing, I use them. I never get bitten by bugs.
If the wind is blowing, the skeeters lay down anyway, and if it stops, the TC unit does its job and keeps them away from me.
I haven't sprayed anythign but Permanone for ticks in 6 or more years and do not miss DEET one bit...from the way it hurt the finish on bows to the way it made my stomach grow immensely large, I hated it and think the guy who invented TC should be given the Nobel Prize.