I use one on my Hano mare, she's a total twit about the little no see ums or mosquitoes around her ears. She's still very rideable without if you don't mind her shaking her head if you didn't get enough spray on to keep the pests away
Plus it looks pretty in the show ring for jumping. Also, if one were sensitive to noise it would be an easy way to hide ear plugs or cotton.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.