I have, and really love, a Festool Shinex. I bought it to update from years of using Random Orbit sanders with foam pads and compound. As 3PedalMINI noted, Random Orbit sanders are safe, and slow. [embarassed]
But, you really have to work hard to screw up a car finish with them.
The Shinex is light, VERY quiet, and while Festool limits its usage to 6" pads by spec, 6" pads still cover a lot of ground on a hood or roofline pretty easily. It has lint filters to protect the motor if you're using Felt or Sheepskin pads.
The spindle locks for removal of the Velcro/Hook and Loop pad, and it has Festool's usual great speed control.
It does NOT come in a Systainer. I bought an older version of a Maxi-Sys to house my Shinex and the Festool pads .
It's also small, not much bigger than the RO90, so if you have multiple cars to power through.
If you DO buy a Rotex, remember the one thing people seem to forget when buying a sander to work as a polisher at times while doing multiple tasks with the tool.
If you sand with the tool for other tasks, clean it THOROUGHLY before using it as a polisher since any dust or abrasive grit lurking in the tool could work out of a hidden crevice and onto the surface of the car you're trying NOT to harm while polishing or waxing. THAT, could get expensive... [embarassed]