It is not the best or most expensive humidifier I have purchased; but for the price, I am completely satisfied. I hope it lasts through the winter season. The low setting is very quiet and the high setting is like a white noise. I am a light sleeper, so the high setting bothered me for a few days but I am getting used to it. I'm not sure how long the water lasts on high but it does make it through the night. I have kept it running continuously: on low during the day and high at night. I top the tank off morning and night but it has not run down. After all day on low, there is nearly half a tank left.
My favorite part of this humidifier is the tank has a handle on top and bottom which makes carrying to and from and refilling under the tub faucet very easy.