I have been using Filtrete filters since 1998. Bought a house and this brand was being used, so I started from there. We are animal, kids and outdoor loving people and was amazed that after a month I just knew I needed to change but , no I didn't, They really do last 3 months!!! I have just started using the Odor reduction 1200 this year and with cats, dogs & grandkids in and out and all the cooking going on, I will always stay faithful to Filtrete filters. I've heard people say they are too costly....no ....I dust less, my ac stays healthy we breath better and guest always let me know how nice my house smells and how I must clean all the time since our animals are always with us. I have recommended this product and have two daughtinlaws, friends and my mother using them.