Absolutely love these purifiers.
When I first got the purifier I wasn't using it all the time. After I got an allergy diagnosis after testing. I bought a new filter so I could start fresh, turned it on and have not turned it off since. That was 3 months ago. I signed up for new filters to automatically be mailed to me every three months. My filter light came on a couple of days ago and today my automatic shipment came in. That filter is slightly gray and furry. It is definitely doing its job.
I've also contacted customer service a few times just for questions. I had, and they are always super prompt to answer, and Explain something fully. About a month ago I purchased a smaller one that I have placed beside my bed.