I haven't had the chance to use them for any length of time yet. They did arrive real fast and the quality looks very good they fit the opening in my furnace. I am anxious to see how they preform when the air conditioning starts. Ask me in July about your filters then. Until then Have a Great day.
The product had far fewer pleats (and thus surface area), and flimsier construction than the MERV 12 version of the leading brand, though a little lower in price. So I'm a little skeptical on the relative performance.