I don't use them. Not a knock against the XG (despite having some fun with the way Fram advertises it), but the cost difference for me between the XG and the M1 EP is so small that I just go with the Mobil. As the Mobil is more expensive, its up to others if its worth the extra cost over the XG.
Contrary to what the OP posted, the M1 EP is not "a paper filter." The cost of both are a little higher for me, though I don't feel "stupid" when I buy it. Its expensive, yes, but I think you get what you for.
$4 - $5 is alot considering the price of oil filters, that is like buying a car for 13,000 dollars when you could buy an equally good car made with better materials for 9,000 dollars, obviously you fall for the "if something is more expensive it must be better" deal.