Product review (2 stars): Not as much output as I would like
I received a Honeywell HCM-350 Humidifier for Christmas (2015) to be used in our bedroom at night.  Living in MA, cold winters and forced hot air heat result in really dry air in the house.  The original wicking filter that came with it seemed to work well for the first 3 or 4 nights, measuring the relative humidity and temperature with an old, possibly inaccurate, monitor.  After soaking the filter in water before using the first time, as instructed in the manual, the first few nights measured in the low 50's high 40's % humidity, then just dropped to just over 30% after that. (Please forgive me as I don't know the exact size of the room, and I know there are many many variables that can effect the relative humidity in a specific area.)  A little frustrated, trying different placements of the unit, soaking the filter every night, still didn't get much better.  I decided to order both a "Honeywell Replacement Humidifier Filter A" as well as this after-market HAC-504 replacement filter.  Also note, I bought the "AcuRite 00613A1 Indoor Humidity Monitor" as well.  I first tried the original one more night to get a baseline with the new monitor - still (what I think is low based on how dry I feel) around 31-32 %.  The next night I tried the "Honeywell Filter A", which was significantly thicker than the one that came with the unit, and the first 5 days measured in the 50's consistently, then dropping to about 38-41% consistently.  After using that filter for about 3 weeks, I decided to see how the HAC-504 would do.  Opening it up, it appeared even thicker than the "Filter A", yet less dense.  Used it for 4 nights and did not see the humidity rise above 33 %..  I put the "Honeywell Filter A" back in and I am still getting readings between 37-41%.  I feel the HAC-504 does not humidify as well due to being less dense. I would not recommend.  Spend the 2 extra bucks on the Honeywell Replacement Filter A.  I might test out some of the other off-brands just to know.  Hope this helps!