Love the way it reduces dust/mold allergens (that's what I'm allergic to). A bonus is not as much dusting in the winter months. Now that the A/C is running, we did run into a problem. Our furnace repairman said sometimes if the filter is "too good" it blocks the air flow. The water line was blocked (only took a moment to unclog), but seems to be okay now, so we are still using the "Best" Filtrete filters. It's been several weeks and everything is running great.