I remember Stick's post. He was saying that a coarser filter soon fills with a lot of sawdust and acts to allow ever smaller particles through. However, I went with the Wynn 1 micron since my lungs have zero tolerance these days for sawdust.
There more recently was a long string that included swapping out the smaller HF impeller with a Grizzly impeller, which greatly increased air flow, but took a long time to wind down. @Furbo didn't you guys spend a lot time working out air flow? I got two HF units (shop and garage), and am thinking of adding the Wynn finter to the second unit. It will be the 1 micron Wynn.
The more I do, the less I accomplish.