I use this thing morning through night with multiple essential oils and it is simply said the best thing I've ever bought for making my house smell good. It's incredibly easy to use, uses no heat, creates very little sound, and works exactly as the box said it would.
You open it up add water, some drops of oils, put lid on and power up. You can set the timer from 2-6 hours and it will shut off. Or just leave it running until the water is gone. Don't worry about it though, because when that happens it will shut off by itself instead of frying itself. The mist output is consistent and can be changed from a lighter mist to something more strong, which is nice. In addition to the mist, the color on the lighting can also be changed, but I like to have the colors changing.
I was initially impressed with how fast it worked, I expected it would need time to heat up or something, but no it was going from that first second. My second worry was that the oils would stick to the plastic and the smell would linger when I changed, but a quick rinse with very hot water took those worries away.