I never found these to be very effective on the V-12 and later machines. Try my test, weigh out several grams of dryer lint and place in the GE plastic filter pan at the start of a normal wash cycle with a load of clothes in the washer. After the cycle is complete remove the ball of lint and allow to dry completely for a few days or place in a warm oven overnight. When you are done weight the collected lint and you will probably have less than you started with. The rapidly moving filter pan acts like a sifter and much of the lint goes right through the holes. While the GE FF lint filters are a little more effective than the ones mounted inside the MT agitators we still had a lot of GE FF customers that just left the filter pan on the shelf above the washer where it at least collected dust LOL.

By far and away the most effective lint filters ever installed on automatic washers were several of the different designs of the Self Cleaning filters that various WP and KM washers had. These SC filters easily collected three to more than ten times the amount of lint that most manually cleaned filters could ever hope to catch. I have had KMs and WPs with this type of filter in the same house where I live now since 1966 and never had a clogged drain or a clogged filter on any of the washers so equipped. Some times when the washer is about to drain I love to pull the drain hose out of the stand pipe and hold it over a dryer lint screen over the laundry tub and as it starts to drain you see a huge amount of lint appear that is being flushed out of the filter. And when you dry the same load out of one of these machines you easily have about 1/2 the lint in the dryers filter at the end of the drying cycle.

My Amana has the filter-rim on it and like John said, is likely about as effective as the rest of the filter gimmicks most manufacturers came up with.   The Amana pumps water through the filter during spin out as well as agitation so combined with the long spray rinse, most of which is directed into the filter-rim, helps keep it clean. 

The GE Filter-Flo pans are pretty good overall at keeping themselves clean by balling up the lint into a tidy orb but there was this one that doesn't do this. It's disgusting.  I'm sure they were making room for a myriad of dispenser options to be placed over the pan, but the design of that well in the middle caused the water to slosh all around and not ball up the lint and filtered debris leaving a nasty mess all over the pan.  This is what it looked like when I found the machine on Craigslist.  I cleaned it up, of course, but after using it for a while can see exactly how it got to this horrible condition.  I've found most of my orphaned filters on shelves and in cabinets at estate sales for the very reason John says, most were cast aside by their owners and remained long after the machine was gone.

Cleaned