Product review (5 stars): They work and are the same as the Vornado ones
I bought 2 each of the original Vornado MD1-0002 and replacement versions by Peerless Aire, thinking to compare how well they worked and how long they lasted.  All four filters were, however, identical in every respect, including the bar code on the wrapper.  Barring an error on the shipping department, they are identical and you should save your money on the original and purchase these aftermarket ones.