I bought 3 of these. I have been using the same thing but older model for the last 7 years. It still works. The good thing about all these is that you dont need to replace any filter. You just clean the filter with vacumn when it shows ”clean filter”. It has the same noise as the old one. I like white noise so it doesnt bother me. The reason I bought 3 is that I wanted to put it in every single room.