I like it...it's quite natural...ingredients one can pronounce and understand. No chemicals. Better for horse, people, environment. I plan to try it when the flies get really bad.
I like to make my own fly "spray" also with water and citronella oil, or Skins So Soft by Avon (who does NOT do animal testing in labs...yay), etc. The more powerful stuff we use with ingredients we cannot understand, the more bugs become immune. There are lots of "recipes" out there for fly spray using citronella, and other natural oils that are better for ALL living creatures. : )