Just got them. So I will have to come back with an update soon. For now - 4 Stars They look to be nice. They shipped very quick ! Mine are an odd size. Nice to be able to buy them online. I had too add some "spacers" to the bottom to get them to cover the opening properly. Definitely look to be quite better than what I was using. Hoping they help with allergies !
I've only used one but the air seems to be cleaner.So far so good.Received it with in a couple days.. I feel they would respond if there were any problems or questions.