Product review (5 stars): New for the price of used :)
I purchased the "used" option because I wanted to save a few bucks and I figured how could this product really be used?  I assumed that it was probably just the packaging had been messed up or it was a returned item and so they had to sell it as used.  I was right, my filter arrived still in the original plastic shrink wrap.  Risk paid off.  Hope it works for you as well.