Product review (3 stars): Does what it's supposed to do
These filters are not great by any means, but they do what they are supposed to do.  Of course, we've found that it is very important to use the right bacteriostat with the filters.  We bought some Sunbeam bacteriostat water treatment for humidifiers at our local Home Depot, and I swear that they just put purified water in the bottle!  Once we started buying the Essick Air bacteriostat water treatment, our filters lasted much longer, and didn't get that musty/fishy smell to them.