My PureSpa Deluxe Ultrasonic Aromatherapy Oil Diffuser is the perfect size, it looks nice (but is not as quiet as I would like). I have it in the hall outside my bedroom and I can smell it in my bedroom. Needless to say I am impressed so far. I would give this diffuser a 5. I am confident this is going to be my 2nd favorite diffuser! I love the price, because of the 10 oils included, the oils alone almost cost that much. Thanks!