 Thousands of five-star reviews. It works very, very well. We've got three of these in my house. I'm here to tell you it works very well. We know where they are because it smells like a thunderstorm has rolled through the house, that room, and it smells fresh and clean. It smells incredible. Any smell is going to vanish after a few seconds with it being plugged in. You plug it into the outlet. It doesn't take up space on the floor. No big, long cords or wires to jump over. You don't replace the air filters either. That saves you a bunch of money too.