Product review (2 stars): Poor life and lower humidity than OEM (Vornado) brand elements
These evap elements lasted less than 1/2 as long as the Vornado branded.  They layers of the element basically separated until the filter became un-usable.  Additionally, the humidifier was unable to maintain the same humidity as when the OEM filters were used.

They aren't terrible, but I wouldn't pay more than 1/2 the price of the Vornado brand.