Product review (3 stars): Not bad for aftermarket
This filter is basically a very large flat sheet of filter material that you cut to fit your model.  It does say this in the description but I missed that so I was a little surprised when I opened the box and found this when I was expecting the pre-cut cylinder that came with my Kenmore humidifier.  After the initial shock I trimmed it down, got 3 filters out each of the two sheets I bought for a very reasonable price and so far, after a few months, they seem to be holding up reasonably well.