I purchased four diffusers, so that I could diffuse essential oils in various places throughout the house, during the COVID-19 pandemic. All four were similar — small, inexpensive, with an intermittent setting.This one, InnoGear, Version 3.0, model MT-039, is my favorite of the four. It runs the longest of all of them, using the intermittent setting; is quiet, and a joy to use. :-)The runner-up is another model by InnoGear, Version 2.0, model AD286, in light wood grain. I purchased this one specifically for a bedroom, hoping that no light would shine through the wood grain plastic, which I am happy to report, it does not! However, this model runs out of water MUCH more quickly than the other model from this maker.If I had occasion to order a similar diffuser in the future, it would be one of the two above, most likely, unless I found something else available that I hadn’t tried yet. The two below, I would not order again, not because they are so bad, that because they are not as good as the above models.Diffuserlove Aroma diffuser and Radha Beauty 160 ml essential oil diffuser, are the other two models that I purchased.There is one thing that I especially like about the Diffuserlove model. The top does not lock into place, you simply lift it off to fill, and place it back on. For anyone who finds that they often have only one hand free to tend to the diffuser, this one would be handy. The other three all require two hands, in order to remove the lid. This one runs for the shortest amount of time, compared to the other three, though, and the on-light is quite bright.And lastly, the Radha Beauty diffuser — My least favorite of the four. What I like best about it, is that it has a fairly long run time, coming in second to my favorite, above. Things I dislike about it, are that the base, which holds the water, is wider in diameter, and when filling it to the maximum fill line, the water is right up near the top edge, and would be so easy to spill, if bumped; so I never fill it to capacity, in order to avoid spills. The light on this unit is brighter than the others; and the buttons feel clunky — there is a slight hesitancy between the pushing of the button, and the accompanying beep.