So far so good! I upgraded from 8 to 11 Hoping to see an improvement in dust trapping. I'll let you know in a month or so. Thanks for making uality products,
Wish the filter was a tad skinnier. When I slide the filter in, my unit causes the filter to squish and the cardboard on top bends upwards slightly. I can’t just check the filter because the filter tears, I have to remove and replace it