My issue is fit. I bought 16" wide and these are almost a quarter inch more and I had to force the filter in the furnace holder. Not a good fit. Quality seems ok.
My issue is with the product itself. I expected the filters to accurately measure 4 depth. I was replacing a Honeywell filter with the same measurements as this product.The filter only measures 3 3/8 inches deep and does not fill the filter space in our furnace; thus making it ineffective.I am very disappointed and wish I had spent a few extra $$$ and purchased the Honeywell brand! Too late now to go through the hassle of trying to box up and return 4 filters.