I only rated it 4 stars because... First: I believe the filters are over-priced. Yes, it's an after-market product and there's always a huge mark-up on anything that's "replacement". Second: the picture is misleading; showing 2 filters...the $10.99 price is for just (1) ONE filter. The picture should represent what is actually being purchased for the price...(1) ONE filter. Filters I've purchased in the past were made of a crinkled metal material. The filters I received this time are a crinkled plastic material. They seem to be working fine. I haven't used them long enough to clean them yet...but I think the plastic is probably a better design (maybe more durable). I ordered (2) filters...only because I didn't want to take a chance on not having enough (my humidifier requires 2 filters). Figured I would use them next year (if the picture was accurate and I ended up with 4 total). Glad I ordered 2 of them.