the filter seems to work well and fit well but it has been a little over a month now I wanted to check if it is is ready to be replaced. and it's bent or swollen where most of the airflow goes, maybe there's more suction in that area, it was hard to slide back. they don't appear to be brittle, perhaps moisture has weakened the filter structure. Anyone else have a problem with this? I struggled to put it back in, it wasn't that messy to use a new one, they're a bit pricey after all! If I work 2-3 months from each of them I will be happy. So I replaced filter #1 on March 5th, 2014, could probably use it for another month, it didn't look too dirty but much weaker. and deformed appearance, it was difficult to get out. New #2 from the same box didn't fit as well as the first new one, had to maneuver and how to pinch it, I think the size was a bit off. I will not contact this test at all for 3 months and we will see how filter #2 holds up. I'll get back to you in 3 months.
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