This is a basic, easy-to-use humidifier. It is quiet with the exception of a fairly-quiet, regular dripping. The dripping may be a distraction if you are a light sleeper. What I like best is the filling procedure; you can fill it from the top without having to remove the water container and take it to the sink. If you do remove it to fill at the sink, it lifts out easily and sits flat. I also like the auto shut-off because I sometimes forget to check the water level. I would give it 5 stars, but I had to return the first one I bought because it stopped working after a couple months. Thankfully, I purchased it at Walmart and there was no problem getting a refund. I would have liked to try a different unit, but it was important to have 3 specific features: Auto shut-off, Ultrasonic (quiet), top-fill. Overall I like this humidifier (not large enough for big spaces, but works well in a home office or bedroom-size room), and I hope the second one I purchased doesn't fail.