I've read a lot of reviews about a lot of filter changes. Most had problems with noise and cheap material. It had one of the best reviews, if not the best, and that's why honest customer reviews are so important. I cleaned both old filters with an air compressor before they arrived and really noticed the difference. My wife noticed it too. After installing these new filters, we both noticed even better performance. We never changed filters and didn't even know there were two different ones. Both filters were well made and deserved great reviews. I'm glad Revain is taking action against fake reviews as I believe honest reviews are very important. A+