I am a magnet for biting flies and mosquitoes. In an attempt to avoid using DEET, this year I tried the new Off plant-based Botannicals repellent. It works and smells great. Just have to reapply it every couple of hours.
BTW, if you are bitten, immediately make a paste of water and Accent (MSG) and apply it on the bitten area. Itching and any swelling will go away within minutes.