The iRobot Roomba is one of the best electronic devices I own. The durability is simply impressive, only the battery breaks eventually since well, there is no escape for this. Even without using crazy AI, it kinda works well, and is one thing that when released looked pretty revolutionary but is actually useful instead of being just a fake induced need.
But I wish they would solve the problem where it gets stuck in seemingly trivial places: I often find mine on top of the base of a floor lamp, or on the gap between a rug and a wall, or, most bizarrely, exactly in the middle of my Steelcase Leap office chair's four wheely legs, which has the exact diameter of a Roomba. It also keeps shutting itself inside my bathroom if I don't wedge the door open.
(I don't have cables lying around for it to get entangled with, although it recently dressed itself up in a natty scarf: https://www.instagram.com/p/BQqWAoRBnsi/)