Product review (5 stars): The best replacement filter out there
Like other reviews you will see here, I've tried a number of different brands and have had experiences where filters fall apart in days, become hard as a rock and or yellow within a matter of a couple days etc.  Quality and size of the filter has been a big issue.  Not with these.  You can see and feel the difference in quality.  I easily get double if not triple the use out of these than the next best option I came across.  Please note that you should rotate them daily and ensure they are wet (if your humidifier runs dry you need to soak the whole thing in water when you refill).  You can find better deals purely from a financial perspective, but when you factor in what you're getting and how long they last it's not even a debate.