I love using it in the living room and kitchen to remove dust and food odors from cooking. It has a sleek lightweight design. I can carry it in 1 hand from one room to the next. When I turned it on speeds 1 and 2, the sound was barely noticeable. Speed setting 3 sounds like a fan running. Level 4 setting is much louder but not unbearable. 
A nice feature is that it will indicate when the filters need to be changed after 2500 hours. The filters can easily be removed and cleaned by hand. 
Overall it's a simple but useful air purifier. I plugged it up right out of the box and powered it on with no issues. The only change I'd like to see is for it to be battery operated.