NOW Foods Essential Oils Ultrasonic Aromatherapy Diffuser - Ultra Quiet, No Heat, Easy Clean with Color Changing LED Lights for Home, Office, Yoga & Spa Relaxation

When I got this diffuser, I was excited about it. It was a pretty good price from what I know about just shopping around online. I am new to essential oils and diffusing them, so I wanted to buy an inexpensive model to get started before I commit to buying a $100+ model for a bigger space. (And I have to save up, that's a big investment for me!) I chose this one because the reviews were mostly positive for a diffuser under $50. I read all the directions that came with it and followed them perfectly. I turned it on, diffusing 4 drops of Frankincense and it began diffusing nicely. I could smell the oil, the mist was fine and cool. About 30 minutes after I had turned it on, I noticed that the light was off and it wasn't diffusing any more. The directions say that it will auto shut off when the water gets down to a certain level. I checked the water level, and it was almost completely full. Turned it back on and it started diffusing again. I noticed this problem throughout the first day of use: about every 30 minutes or so, I would notice that it had turned itself off again. Rather than immediately return it to Amazon, I decided to try the customer service number. I was connected with a real person after a few minutes on hold. I explained the problem. The customer service rep told me that it will run "UP TO 8 hours, but it should definitely diffuse for at least 3." She said that she would send me a new one. I asked if I should send my current unit back to them. She said no, just keep it and dispose of it when your new one gets there. I was overall very pleased with the customer service experience. Hopefully my new one will come soon. I'm planning on keeping this defective one around. It's fine as long as I'm sitting right next to it to turn it back on whenever it shuts down. So besides my unit being defective, here are the pros and cons.Pros:It's almost silent and pretty compact.The lights rotate showing really pretty colors. I like that I can stop on my favorite one or turn the lights off.It is easy to set up and seems like it will be easy to clean, though I haven't done it yet.The shape of it makes it hard to tip over, which is important when you have little kids like I do.Customer service was helpful and very reasonable.Cons: It's small size makes it not very powerful. It would be great for a small office or bedroom, but I have an apartment with a very open floor plan. If you need to diffuse for a big room, I would recommend getting something bigger and more powerful.As others have said, the power light stays on if it's running, and the power light is pretty bright. It might bug you if you are diffusing at night and you want your room pitch black.My star rating is for my specific (defective) unit. If and when I get a new one, I will update my rating.***UPDATE***My new unit came in a few weeks. When it got here though, I didn't even take it out of the packaging because I had gotten my original unit to work. I cleaned it as per the directions using 1oz water and 1oz white vinegar. I let the mixture sit in the diffuser for about 20 minutes, then wiped it out with a Q-tip, focusing on the white disc in the center. After a few cycles of diffusing and cleaning, it worked its way up to diffusing several hours. I haven't timed how long it works now, but it diffuses at least 5 straight hours. I'm keeping the replacement in the closet in case my original does go kaput someday. I can't use both of them at the same time because they only sent me a base , not a top, and it won't work without the top. I changed my original rating from 3 to 5 stars. I've been recommending this diffuser to everyone who asks me (I now am a product consultant for doTERRA).