Product review (3 stars): Added Bonus: Cancer-causing chemicals??
Filter seems to work OK, although it has no support, so once it's wet, it's very soggy and soft.  This makes it a little difficult to install in the humidifier.  Overall, it's not bad.

I think I ordered these last year, but now there is a sticker plastered on the box that warns about cancer.  Interesting.  I'm going to have to write the company to ask about this.  I'm not too thrilled about toxic(?) chemicals in a product that will affect the air I breathe.  Why isn't this mentioned in the product description here on Amazon?