My trusty 2006 Roomba Discovery, still regularly cleaning my workshop. I've repaired him several times over the years, and have just replaced some MOSFETs and transistors, but he's still reliable and hard
File:Roomba Discovery.jpg - Wikipedia
Roomba - Wikipedia
Roomba Discovery Review and Testing
Best Buy: iRobot Roomba Discovery Bagless Robotic Vacuum Cleaner White 4210