I've got the robot vacuum of Theseus here... early, 2nd or 3rd gen Roomba I guess it is, I've probably had since 2009 or so I think. I've replaced damn near all of it, and I'm ALWAYS shocked when something new breaks, I check online, and I can get a part and replace it! And often times the replacement ends up being an upgrade too. I think it must have come from the Twilight Zone or something, I don't know.