I run very high merv filters 13 and 16, but I actually have large format filters still flow very well. vs the 1" thick type that still flow very well.
Ones an accordion style EZ flex with one side pleated, the other a giant box 20x25x5
Both my places are in high dust/ areas and this makes a noticeable difference in air quality.
Never once lost a motor, inherited a cracked firebox on a low efficiency filter, lost electronics.
UD