Product review (1 stars): Falls Apart and Collapses
Bought a bunch of these a few years ago.  I've used them a few seasons, but will not be ordering more of these.  First, some of them fall apart when you pull them out of the box, losing 1-2" off the end.  Second, after being in the humidifier a while, they collapse and fall apart further.  A picture in a January 24, 2016 review here shows the same as I experienced.  On one occasion, the collapsed wick fell against the water level sensor so that the unit continued to show 1/2 full, even though it was actually empty.  I've bought another brand that appears sturdier.  I'll be checking to see how they work for the rest of this season.