you know i was thinking about this while driving today.
i've ridden in many 5th gen ludes. i really didn't notice any air quality difference at all. even nicer cars where i know they have like nicer filters. you have to pass by a water treatment plant on the way to my house. everytime you pass by at night, you will smell it (worse on hotter days) but those car running a/c recir or not still get that smell. i still get allergies in other cars as well.
so i mean, i guess it might be nicer to know you are probably getting a little cleaner air, but to me it seems as though it wouldn't work in my situation. therefore i wouldn't put too much effort into this cabin filter.
OT: i've seen cabin filters before and they look like vaccum filters, dirty.....but so is most of the air everywhere