I just bought the Rigid version, then walked into Rockler to see this extremely similar item for $20 less, plus a $60 gift card.
https://www.rockler.com/triton-ts…elt-sander
It’s a woodworking tool helpful for bulk sanding with the belt sander or sanding curves with the spindle sander. It oscillated to more evenly use the sandpaper. It also has a built in adjustable table to use as a reference surface to ensure flatness or your desired angle.