I bought these purifiers because of the rave reviews, but I don’t sense any difference in my home after using for 2 1/2 months. I live in a small townhouse, so all the rooms are small and I have one purifier covering various rooms, but there’s been no difference in environment. I spent good money on these and feel I could have bought better purifiers elsewhere for a similar price. Recently, one of the purifiers just stopped working and because I have the 2-year warranty, I reached out to customer service. After having to send proof multiple times that the purifier was defective, they finally were going to send a replacement, but wanted to charge me just under $20 to have it shipped. A couple dollars, I might be able to see, but it wouldn’t even cost me that to send the defective one back, if they asked for it. I just don’t feel these are worth the hype. Maybe in a small apartment, but for a home, you’re better off looking elsewhere.