Theses filters are great, and I love that it is on a subscription and I don't have to go an extra week or month without buying the filters from a store.
I put in a new A/C system with new ducts and wanted to make sure we have clean air in the house. They get dirty WAY faster than MERV 8 and I replace about a third more often now. But that's GREAT. I love to look at the accumulation of particles. Maybe someday I'll buy a microscope and look at it. But for now, I'm happy.