Product review (5 stars): This one is much better.
The original aluminum pad does not hold or evaporate the same amount of water as this paper treaded pad.  This pad dumps more moisture into the house, uses less water, and holds a steadier humidity level (I have a separate humidistat).  It needs to be replaced more often because it is more efficient and thus builds up more residue.  This last negative point is probably why it is not furnished originally.  This one is much better.