It's a nice, small-footprint humidifier. I've never used the diffuser (which is just a tiny cup in the "grill"--nothing special), but it works fine as a basic humidifier. It's very easy to clean, and difficult to tip over accidentally. There are just two drawbacks: it sounds like those $15 "boiler" humidifiers that you can pick up at a drugstore, and you have to refill it twice a day if you're running it 24-7. The blue light is a bit bright, but you turn it to the wall and problem solved. It's a good little unit.