Product review (3 stars): I expected average, and was not disappointed.
It fits the Relion wicking humidifier and performs it's function well.
If you handle it, you may conclude as I did, that it wasn't going to last. I am unsure if this is cut to fit the Relion, or sold by them. Either way, these filters are cut from a larger sheet of filter material, and this didn't appear to be done by a precision machine, but they do fit in the tray inside the humidifier.
The two I purchased began to loose their cohesion after 3 weeks or so.
These filters are about 12 dollars including shipping. Recently I purchased this at Tahrjet - http://www.amazon.com/Vornado-MD1-0002-Replacement-Humidifier-Filters/dp/B000E1385Y/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1393901938&sr=1-1 for about the same cost as Amazon. The quality is superior.
Using the existing filter as a template, I cut out the replacement I am currently using with a razor knife. I estimate I will get 2 per included Vornado filter, or 4 Relion filters per package. The width is approximate and it fits into the tray without a problem.
I was concerned that the thickness of the material, in combination with a different flow rate of the fan might result in a less effective humidifier, but it is working just as well as before.