I've enjoyed wholehouse air purification for 3.5 years now. The obvious bacteria removal out of the air and off of surfaces has resulted in a great reduction in respiratory ills for my family including 6 children. The removal of odors like pets, smoke, mildew, bedwetting, cooking, etc. is obvious. Since this one unit covers up to 3,000 square feet, it's so nice not to have to move it from room to room 24/7. But yet it's light weight enough to easily move to a nasty/needy area when needed. Plus it has a 2,4,6,8, hour sanitize feature (away mode) that is useful in an unoccupied room or when everyone leaves the house for the day. I love controlling the air quality in my home.