On a whim, I purchase a factory refurbished iRobot Roomba 655 and gave it a go. I wasn't expecting much, but these things work! I put it in our guest room where the door is always closed and where I had vacuumed a couple weeks prior. After about 20 minutes in the room, I let it out and checked the bin. It was filled with both cat and dog hair (two cats and a German shepherd) even though none are allowed in the room. My daughter confessed she sometimes lays on the bed in the room and lets the cats in.
It's scheduled to automatically clean at 0200 on Tuesdays (arbitrary day, when all are sleeping). On occasion is might wake us by bumping into the bedroom door but otherwise we never knew it spent an hour or more cleaning the living room, dining room, kitchen, foyer and hallways other than all the hair and stuff in the bin (that has to be emptied). So far, it always finds its way back to the dock to charge. It's very low maintenance.
My wife ordered a "Ziglint D5" yesterday (either Ebay or Amazon) as she's been bit by the big it seems. We have yet to receive it, but it appears to be a superior unit in every way than the Roomba we are using now. She would like to give her parents the Roomba and use this newer D5 that is WiFi, has mapping technology and a less erratic cleaning pattern than our older-model Roomba. It also connects to Google Home or Alexa (we have an Echo Dot which it used often).
Does anyone else own these things? I enjoy watching the thing clean for some reason.