Product review (4 stars): It does work, but the smell and size is a little off
Update: after the first couple of nights the smell went away, and the filter "shrunk" so that it fits better now.
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Not really sure about these. It's doing the job because my hygrometer is increasing. But the "new smell" (?) is pretty awful!  I'm hoping it will go away after a few uses.
It also is a little too big for the Vick's V3100.  I had to squish it together to make it fit in the base, but now the tank isn't sitting right on the base which makes me nervous.  Another review cut theirs in half which is what I will try, but still hoping the awful chemical-ly smell goes away!