Product review (3 stars): It's thin like others have noted
There has been a redesign of these filters.  Gone are the thick filters that used to work great. The new filters are about 1/2 as thick and work about 1/2 as good in humidifying the air. I called to manufacturer and they told me:

"We have many Honeywell units that use the HAC-504AW filter, and unfortunately, due to the filter thickness we had several units that were having a lot of trouble fitting the wet filter. There were many accounts where the filter would cause the tank or housing not to sit correctly, where it would get caught on an internal humidifier part, or where it would absorb more water than the fan could take off of it efficiently".

I say to that, I don't care. Give me the thick filter and I'll deal with the rest. Too bad this option does not exist.  Actually I think this is just BS.  Probably they found a way to cut costs, and they figured no one would notice or care.

So the new thinner filter in fact does work, so it's not a complete loss. On the low setting, you can refill the water once a day.

HUGE TIP HERE: Don't keep buying filters to replace dirty ones.  First gently rinse them with warm soapy water. Next let it soak in a small bucket with warm water and a little bleach. Now rinse and replace.  You may smell a touch of bleach for a day or so, but it will go away.