I really like my Fein. I have it hooked up to my EX-21. Doesn't have the HEPA, but I wear a dust mask while scrolling. (Plus, I live on a gravel road, open my windows when it's nice out, have forced air heat, etc etc, so no need for the HEPA). I really like the Fein, it's about 2 feet behind me when I'm scrolling. In my opinion it's very quiet. I have a remote that I use to turn it on and off,