I started using this filter this year when I changed filters. I love it! It really seems to be taking a lot of the allergens out of the air. I have many indoor allergies, dust being the worst, and I've really noticed a difference this winter. I'm sold!!
I'm a renter and my landlord replaces the filter with the least expensive product out there. The place was constantly dusty, even the floors. As an experiment I replaced the filter with a Filtrete. Almost no dust, way less sneezing, and when I changed it again, I could SEE it was doing a good job. What had been all over my apartment (and in my lungs) with the cheap product was trapped in the Filtrete.
My husband and I started buying these filters for the house (we live in a rental unit) on a regular basis when we moved in almost 2 years ago. There are 3 air intakes where we replace the filters. Using these filters help me SIGNIFICANTLY during allergy season here in Virginia. They are fine quality filters that do a wonderful job of harboring "the yuckies" that lurk in the air so I don't have to inhale them myself - and they do a great job of overall dust collection so I'm not inhaling that, either!
We have used these filters for the last several years. After trying some cheaper alternatives we decided it just wasn't worth it. We can certainly tell a difference in the air quality in our house - heck, we don't even have to dust as often! Great filters.