Ya know, I know it sounds argumentative, but there is a difference in quality. I don't work for any filter company, never have. But with a filter cutter, I've had the opportunity to cut into MANY filters in the field, as an indication of what the motor is doing. Now I'm not in a lab, nor am I a scientist, but us "old timers" have a trick or two to determine a filters/motors health by a simple bit of surgery. And despite some "abstract" standard on a filter that means very little to me, a quick glance into an opened filter would tell a heroin addict what is a decent filter, and what is cheap junk.
The cardboard issue is just name calling, as most filters of this variety are paper. We have a large vessel here on the hill that uses rolls of paper towels shoved down in the cans for this, and seems to work very well. I guess it beats 100 dollar Cat filters.
So, ya'll do what you want. I really couldn't care less if people filter their fuel and oil through a Brita. I work on inboard diesels, so really, please do.
But to put one of those cheap pieces of junk on MY engine? I'd paddle my boat past a Fram delivery truck, to get to a dirty looking Wix..