Very satisfied with this purchase.  I have allergies and a small bedroom,  and after several weeks of use, I am happy to say that this is just what I needed.  I chose to put and nicely scented fabric softener sheet over the filter when I set it up, and my room smells so fresh.  The size and style are perfect, and I don’t hear it at all.  I was also pleased to receive a two days after my order.