I do too have one mounted !! the main reason to use a reusable filter  is the fact that upon oil change the inner filter gets to be washed in varsol  over a fine cloth and CHECKED for metal  then if some fine metal particles  are found,  by running a magnet over you can determine if some preventive maintenance is required  ( AKA  big big saving) before all goes to pot even with fresh oil . when I flew radial engines airplanes, every 50 hrs we pulled the filters screens and checked the filters that way to ensure  long life for the engine,  a cheap way to get piece of mind  believe me!!! now with a paper filter you throw it away when you change oil   but you are none the wiser!!