I have purchased filters from Filter Buy for the past 4 years. I have 5 filters in my house. of the 5, there are a total of 3 different sizes. I'm very satisfied with the quality of the filters, they arrive in a very timely manner and it saves me running from store to store for the sizes I need.
I was expecting the filters to be much "cheaper" quality when I ordered them. They are to attach to my box fan in my shop. I opened them a week after I got them and quickly replaced all of them in my shop. They are better quality than the big box stores filters that are twice the price.
Cheaper than the box store filters, and you know the exact size you are buying. Some of the brands I tried would barely fit in my filter box. These ones for perfectly and I knew it before I bought them. I haven't noticed any difference in allergens, because it's winter and I'm allergic to all the summer stuff. The filter looked plenty dirty when I replaced it with another from filterbuy. Thanks, Ben Shapiro.