I was introduced to FIlterBuy listening to the Dan Bongino Podcast. The filters are perfectly doing the job. I also, very much, love the convenience ordering the filters.
FilterBuy ships to me at appropriate intervals, so the arrival of new filters is my reminder to change them. The high quality filters from FilterBuy always come out of our offices four furnaces dirtier than the cheap filters we used to buy at a big box DIYstore. That tells me they are doing a better job of taking the dirt and dust out of the air we are breathing. I am a happy FilterBuy customer.