I can't say enough about how fantastic these diffusers are! I purchased a travel sized mini-mobile one for my stressful commutes to work and the opalescence one for my office. I was worried about how much area such a small diffuser would cover and hesitant to purchase initially. I am so glad I did. Make sure to buy a large bottles of your favorite oils to keep them in stock because this diffuser does go thru them quickly. However, I am in love and will never go back to another diffuser!