I received my Wynn Spunbond filter a couple of days ago. At first I thought I'd have to make a plywood donut to sit between the DC and and filter in order for the filter to sit properly, but once you apply the turnbuckles, the thick rubber gasket on the filter squishes and seals (from what I can tell anyway). The Wynn filters aren't cheap, but w/a period cleaning with compressed air, they SHOULD be a lifetime filter, especially for a hobbyist like me that doesn't generate sawdust but a few hours a month.
I was AMAZED at how clogged the stock filter bag was. I guess it never occured to me to remove it and shake it out. Duh. I didn't see much dust in the bottom of the bag so I thought the Thein was catching it all. The dust caking the bag was mostly MDF dust, which as we all know, is like talcum powder. Ocassionaly, I'd shake the bag good and watch a little dust fall into the bag below...no big deal, I thought. Note to self: Don't build anything out of MDF if you can help it.
But when I removed the bag to install the Wynn? Holy smokes, there must've been 5 pounds of dust, an inch thick, just CAKED into the bag. I really don't think I could've removed it all since the inner bag material is sort of "porous" and the dust was in there good. I just trashed it.
Ironically, I'm neck-deep in gluing up projects now; all the milling/cutting has been done, so I can't test the filter properly.
I did scrape some sawdust out of the bottom of my TS and sucked it up. From what I can tell, suction seems to be marginally improved, but it wasn't an issue to begin with. When using the DC to clean my workbench it will suck up screwdrivers and pliers if I'm not careful...the HF DC is a beast. I have 20 feet of flexible, 4-inch hose and due to my shop layout of every single thing being on wheels, the hoses are always running here and there; I'd imagine if I had a hard-piped layout (someday!) the suction would be even better, but like I said, there's plenty there now. If anything, the DC SEEMS to be a bit quieter now, but that's a very subjective observation. I'm looking forward to using the Thein and the Wynn more in the near future.