Thank you for your feedback on our Diffusers. The Ultrasonic is designed to be used with water so the dilution of the water to essential oils and the length of time that it is running will determine how long your essential oils will last. It also works as a slight humidifier which is beneficial for the dry air that is typical during the winter season. The Ultrasonic also comes with a built in timer which can be set in increments of 30 minutes up to 180 minutes. Although the Nebulizing Diffuser does tend to be a bit more therapeutic due to the concentration of essential oils released into the air; the Ultrasonic is also therapeutically beneficial. The Spa Model with the pads is designed more for aromatic benefits and the essential oils diffused into the air don’t tend to last as long.
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