Here's what I found happening when I used Revo to uninstall Comodo (CIS).
If I use Comodo's own uninstaller and reboot to remove the application there are just two registry entries doing a reg search.
removal setting finds 5 registry entries.
Medium finds 169 files and folders.
On reboot and opening Regedit I found just two registry enties. Same two entries Comodo's own uninstaller leaves behind.
Revo removal setting finds 27 registry entries.
Advanced finds 177 file and folders.
On reboot and a search through the registry I found 36 Comodo instances. There were multiple legacy entries for the main application components, CMDGUARD, CMDAGENT, CMDHELP, COMODOBACKUPSERVICE. Its an absolute nightmare to remove them all as you have to gain privilege permission to manually delete.
Certainly Revo uninstaller is of no benefit when removing Comodo. I think you can do more damage than good if you are not careful.