I’m a veterinarian and this is my first time using this product on personal horses. So far, I’ve been quite pleased with the simplicity of getting the mask turned on and set up for my two girls. The masks seem to fit them quite well and are seemingly not uncomfortable. Be sure when you order that you get the correct model - this one is a one time use mask, but there are models with replaceable lights from year to year. Looking forward to next spring and seeing how well the girls start cycling earlier and shed their coats quicker. Happy breeding!