Product review (5 stars): Great item, as expected.
I have a Holmes model HM7808 and live in Arizona.  We have probably had this for about 2 years using it off and on without changing the filter, just soaking in vinegar and rinsing them.  Bought this 3-pack of filters just because I finally remembered to and we use the humidifier every night now.  I only needed 2, but bought the 3-pack because it was cheaper.  What a difference!  Easy to change and not expensive at all when you think about how much use they get, especially if you rinse them out yourself periodically.  Will definitely purchase again.