Aromatherapy devices come in all shapes, as long as those shapes are either cylinders or spheres. The GreenAir Eterniti is of the spheroid variety, albeit with a handle-like arch on top. This handle isn't for carrying the unit, though. It's a ceramic disc where waves of ultrasound dissolve scented liquid from the tank below into aromatic mist, carrying the odors of exotic plants through your home to help you relax, brighten your mood and generally make everything smell good.
The control design is elegant. Simple white buttons on the lower half of the sphere select one hour, two hours or three hours of aromatic misting. A fourth button toggles between continuous and intermittent release, the latter doubling the amount of time that the water, and those expensive droplets of oil that you put in it, are going to last. (If you put in more oil than you intended, intermittent mode should also moderate what could otherwise be an overwhelming barrage of fragrance.) The unit can hold enough liquid for 12 hours of pleasantly aromatic action on continuous mode and 24 hours on intermittent.
GreenAir claims that the unit is silent, probably because ultrasound is by definition too high pitched for the human ear to detect. (There's no word on whether it causes dogs to start howling.) They also claim that the unit produces negative ions, which can remove germs from the air, so whether or not aromatherapy is actually therapeutic, the Eterniti should reduce your chances of catching a cold. The top part of the unit glows in changing LED colors. If you find that you've grown particularly attached to a color, pressing a button freezes the color cycling and locks in the color of your choice.
There's no question that the Eterniti is an attractive device and Amazon users give it an average four stars out of five, with the word "love" coming up a lot in reviews. If you think that this is an oil diffuser that you too might love, your shopping may be over, but if you want to compare it to other diffusers on the market, this website has a large selection. Start with the Aromyst Ultrasonic Glass, the cheerfully named Smiley Daisy Gardenia and the Welledia Wellspring.
I love this diffuser. I set it up every morning and it last through the night. It is a lot better that the oil burners that I have been using.
My favorite diffuser by far. Love the intermittent setting for sleep.
My family loves this diffuser. It has timed intervals that you can choose, or will shut off automatically when the water is too low. Subtle, yet powerful, at the same time.
Lights are beautiful but very little fragrance using 100% pure essential oil.