I like hot mist vapor, and the warm mist setting is definitely not like a warm or hot mist humidifier like a Vicks warm mist humidifier or Honeywell warm mist humidifier. This humidifier has great settings, is easy to clean and fill, and on highest setting it releases a lot moisture and will run all day on high. I just didn’t like that warm setting didn’t get hot so thats why it got three stars.
This is a perfect size (I don't want to carry more than that), very quiet, no lights to bother your sleep (optional light to illuminate water in the tank). Ultrasonic is the best technology for humidifier. It comes with a descaling filter which drops in the water, but it is optional, so you don't have to repurchase. These units are so cheap, it's not worth buying the filters - just replace the whole thing when it dies. My previous ultrasonic humidifier lasted over 10 years (being used 6 months a year every night), I have very hard water and once a year I just poured CLR in the bottom, left it for a few hours, poured out and rinsed with water - done!