This is great for the size. I have several of this all by different designers. This is the largest in volume I have found. I love it. I dislike the smaller ones. I like being able to feed more essential oil based on volume of water. Not to mention there is a remote control to this unit. Being able to control the unti remotely is very nice. The unit has so many features it would be too lengthly to list then all. I do enjoy the 7 lights, the strong mist, the light mist that last 16 hours. There are also timed mist options. There are a few different options. Overall this has been the best buy for me, aromatheraphy wise.