Product review (2 stars): It flops over.
Every other filter of this type that I have bought over the years has been reinforced/stiffened in some way, making it stay upright. This isn't, and it flops over, which makes putting it into position in the humidifier annoyingly difficult. I mean, it works, and I won't be throwing it away, but I also won't buy this brand again.

I've used other filters from this company and found them perfectly fine (in fact, I just reordered some filters for my furnace). But there are better options for this particular item.