Product review (5 stars): If you need it then you need it, this one gets the job done.
If this is the type of wick filter that your humidifier uses then this is a must have.  I have purchased this type of wick filter from two different manufacturer and they are identical.  I would just purchase whichever is less expensive at the time.  I tend to buy 2 or 3 of these at a time so there is less chance of running out when one needs to be replaced.

Only recommendation is that you fully submerge these in water or run under a faucet with cool water prior to first use.  This will allow it to wick better for you.