Does exactly what you should expect of it. Smaller unit that works great for a normal sized room, but one room at a time. Extremely lightweight and easy to move around as we do, from the bedroom with us into the living room each day. Helps so much with the allergies at night, we have bad dirt and allergens in the apartment complex's old AC/Heat vents, and helps with the dog allergens so much so that my girlfriend no longer notices she's in the room. We use whisper for normal use, and medium or higher to clean a space quickly after the dog has been there a while or after cooking. Puts out a small amount of white noise which is nice at night.