The Crane Ultrasonic Cool Mist Humidifier is an awesome filter free unit.  The half gallon tank size is compact and runs all night without any problem.  The 360 degree nozzle allows me to place the mist flow wherever I want it and that is great.  I’m a huge fan of aromatherapy so the vapor pad is perfect for me.  As an allergy sufferer this unit has been a nice addition to my home.