Our three year old has asthma, so we wanted to take steps to improve indoor air quality. After some research, decided to pull the trigger on three of these for the house. The quality is great, and the warranty provides peace of mind. I honestly thought the air quality indicator would likely be just a marketing gimmik, but it really does work. If there is a change in the environment it reacts quickly and changes accordingly. It seems to be quite sensitive. My wife was using spray cleaners in the kitchen and the two units on that floor turned red. They've reacted to cooking smells/smoke, kids playing around them, dusting, etc.

If I had a couple suggestions to make... 1) Allow the lock to be turned on while the panel lights are off. 2) Add WiFi capabilities with ability to build a schedule for run times and speeds. 3)Remote control would be nice if WiFi not possible, and didn't add significant cost