I have had this device for 4 years, and it works well after heavy use, often all day and night. I use the pads that go with the device to infuse scents I have made and mixed, plus use the menthol eucalyptus pads as made by the manufacturers. It makes the whole bedroom smell wonderful, plus during times of nasal congestion, helps me breathe better and alleviates minor headaches. Recently, my cat contracted bronchitis and needed a long recovery, and this vaporizer improved her breathing at night and made a difference to her as she recovered. We both breathed better and slept better.