Product review (4 stars): Seems to be doing the job well so far!
It was a little bit slow on the shipping side, but they fit well & were super easy to install in my humidifier & seem to be working quite well so far.  I like that these do not have a metal exterior as the last filters I tried.  That metal made it difficult to fit the filters properly & I felt at risk of hurting myself handling them.  I like this filter much better & hope it will give adequate length of service.  If so, I will be reordering.

UPDATE: (in use for nearly a month now)
I have been amazed at how much better this filter is performing than the last brand I purchased ... seems I am filling the water reservoir quite often & that means there is a lot more moisture being put into the air.  It also has enabled my humidifier to perform more quietly & efficiently.  I am quite the happy customer & will definitely be reordering this filter!