Product review (2 stars): Very poor working life
These fit well and worked fine at the beginning, but after a few weeks they do not "wick" the water up into the upper part of the wick.  Above the water line the wick is essentially dry.  The Emerson wicks are about 2.5X the cost, but work at least through the entire winter.  While these certainly seem like a bargain, I was surprised that they stopped working almost completely within weeks.  I won't get them again.