Being stuck inside with two dogs and a cat for the past 5 months and high pollen counts, my allergies were winning. The first day I received, I had already prepared myself that it wouldn’t work. Within an hour, on the normal setting, my sinus were clear and I was able to breath through my nose!! Highly recommend! Super easy set-up, take off the packaging and plug it in. The size is great and it also provides a nice “white noise” affect.