It's my favorite fly spray! I like the smell and it works well on our flies.
I've never had a horse have a reaction to it (but it's good to know that can happen.)
It's a good value for the money (I get it online for about $12 a bottle). Anything cheaper that this just doesn't seem to repel flies for me. I've also had good luck with Mesquito Halt. There are a lot of good fly sprays if you can spend a lot. But I really don't want to spend $18-$20 or more a bottle for fly spray. But I've found most anything in that upper price range works well.
Pyrhanna is like $20 fly spray in a $12 price range.
Actually, our local feed stores DO charge that much for it.