Product review (4 stars): Thick filters, very absorbent, good performance. Somewhat weaker construction than others.
I purchased three brands of aftermarket filters to compare to the OEM for our HAC-504. This one is the thickest and most absorbent of the bunch. It performs very well and does a great job wicking the water. The downside is that the soft, fluffy construction leads it to break down faster than others, so it's useful life is shorter. We only get about 3 weeks out of these ones before they become unusable. Overall, I would definitely recommend these as long as you are willing to change your filter a little more often to get great performance!