Product review (5 stars): From a very frequent humidifier user
The old HC-14 filters I always bought from Amazon have lately lasted only one month at best before turning into yellowed, crusty, smelly, nasty things.  They were always advertised as lasting up to 4 months and recently went up in price by 150%.  THESE filters, however, actually last weeks longer and cost a mere fraction of the usual HC-14s.  I know they're supposed to be the same filter for the same model humidifier, but these ones are higher quality, without question.  I am a long-time Honeywell user whose humidifier runs 24/7 from October to April to combat flu viruses, and our family gets sick with a cold or flu -- on average -- only once every 18-24 months, so keep your environments nice and moist, people.  I highly recommend these filters.