Having discovered the
small Grex pneumatic ROS I'm seriously considering upgrading my compressor. I'd love to find a similar electric sander, but AFAIK there is nothing even close. My current compressor, a single stage 80 gal from the Home Depot 25 years ago won't keep up with the sander. For now I sand for 2 min than wait 5.
The new generation of brushless motor electric sanders are wonderful, small and well balanced-- I have both a Festool and Mirka Deros, but they are too big and unwieldy for sanding inside bowls. My trusty Sioux angle drill is still going strong, but is not a ROS and leaves swirl marks when used off the lathe. The Arbortech ROS attachment for an angle grinder works well, but the noise and weight of an angle grinder is seriously tiresome plus the bulk of the grinder limits maneuverability. The little Grex pneumatic is just about perfect and a great justification for pneumatic sanders.