I've been using a Now Solutions Ultrasonic Diffuser that my Mom got me, it's starting to not work so well. I really liked how it changed colors, since I use it in the girls room at night to diffuse lavender and it acted as subtle night light. I'm going to give it a good cleaning, but I don't think that will help much. I contacted the company, and from what I've read they'll replace it since it's a known issue, but I should expect it to happen again.

I'm wondering what you use, and the pro's & con's. Thanks!!