Installed first filter two weeks ago. Looking to see a reductionOf sneezes and better breathing for my wife. Don't expect drastic change but hoping for overall improvement in home air quality. Too soon to give you an answer.
1 filter was so bent and dented it wouldn't fit cleanly into furnace1 filter came with a big opening in the plastic and dust already on the filter1 filter was good
My size needed is a difficult size to find(18X20X4). They not only had the size I needed but with different levels of allergen control and bulk packs. Shipping was very quick. Price was little steep but like I said, hard to find so didn't have much choice...