It is small and discreet, however quite poowerful and efficient. A full bottle of the Aroma (my family enjoys "My Way" frequently) can be set up to be effective for about 60 days. Even in my living room with ceiling space over 18 feet high, this diffuser beautifully scents my whole home. I know that it suggests in the advertisement that it is intended for 800 sqft, but mine easily covers the first 2,500 sqft of the first level of my home. And, BTW, using the HVAC is the most efficient method of use.
Now, Iif there were anything that I would bring up as a consideration is that if you choose not to incorporate the unit into your HVAC and use it in a gathering space, the unit is not silent. My unit is into it's 3rd year and, perhaps, Davinci has created quieter models. I will say, in fairness, that even though one may become aware of it working in the background, the sound certainly is not invasive. So, no worries, really.
Enjoy this unit with confidense. The Davinci is strong and made well.