Product review (4 stars): Good product
It works well enough.  Maybe its manufacturing is more complex than I think, but it seems a bit expensive for the materials from which it is made.  I use only reverse osmosis water in the humidifier,and I think the filter should last longer than it does.  Still, it works, and when one lives in the desert southwest, a humidifier is not only useful but necessary.  I don't know of any other filter that would work in the humidifier I have.