They do come in handy, when after being on the dirt & behind other vehicles in the dust.
It means that later, when you turn on the fan, you don't get that sudden blast of dust that was lurking in the A/C ducts, waiting for it's moment to spring on you & catch you off guard!
![Razz](http://www.ausjeepoffroad.com/forum/images/smiles/icon_razz.gif)
I have an '08 without one.
On the gripping hand, I drive with the top off once it is warm enough & tube doors... Pollen filter!?
![Mr. Green](http://www.ausjeepoffroad.com/forum/images/smiles/icon_mrgreen.gif)