I don't use sanding disks but very rarely. I use the flex for flap wheels and of late I'm using 3M Scotch Bright wheels. I also use the flex when I want to use a hard buffing wheel. I use the grinding wheel now and then. I do use the fiber wheel a lot.

On my first motor the variable control quit. So I got a router control from Harbor Freight. When the Harbor had a sale on the motors again, I picked up my next one with warranty. I cut the shields off the old one and put on 4" buffing wheels. I finally burned out the motor and sucked it up and bought a buffing lathe.