Our dogs love it
I would like to say this thing works very well, but really can't say for sure. We have one on a low outlet in our kitchen. Our two little dogs like sleeping in the kitchen. Neither is an especially smelly dog. One is a poodle, the other a dachshund. It does make some noise if you're looking for something perfectly quiet this isn't it. The reason I know this is our dachshund is kind of OCD. If I unplug it while he's sleeping, he will bark. I plug it back in, he stops barking. There's some novelty value to it as well as it's a little bigger than I expected it to be. Our kids' friends come over and they all ask about it, inspect it, etc... Our kids tell them about their weird parents who play video games, watch old Science-Fiction movies and I think the visiting kids think it's some kind of Sci Fi device. Our dogs are bathed at a minimum of once per week so there's really no way for me to know if this is helping keep our house smelling dog-free, but when my mom moved in with us she really disliked having dogs in the house based solely on the odors associated with house dogs. She has lived with us for over a year now without a complaint about the dog smell. So that's good enough for me. There's no maintenance with these, but keep in mind the noise level. It can be heard from 7-10 feet away, but not in a loud, annoying way. More of a hum.
Rating: 4 stars