Product review (3 stars): They had an odor, but it faded away with time.
I bought these November 20 on Amazon, and installed them yesterday.  There was a noticeable odor that we found objectionable.  I read the other reviews and noticed that no one reported the problem.  My wife and I agree that it would be impossible for anyone with a normal nose not to notice.  So, maybe it's a new problem not previously known.

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The following morning the filters, still wet inside the humidifier had lost most of their "scent".  Stay tuned.

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And now, about a week later, the filters are installed and are working properly without any detectable smell at all....so I am raising the rating to three stars.  Had they been odor free from the beginning, it would have been 4 or 5 stars.

The shipper, when notified of the initial problem, refunded my purchase price  and advised me to dispose of them instead of returning them. Meanwhile the smell disappeared. Great service.

So, if you can soak them up outside for a few days, these filters will be OK and worth the purchase price.