The roomba is a great success so far. I just have to remember not to pile so much crap on the floor. If I leave my boots in the middle of the living room, it spends a lot of time nudging them and wondering if it should try to climb over them or just shove them around.
Here is a shot of the back of the sofa, where the Roomba can not reach. That is Ben's tail. He is hiding just as hard as he can from that hideous cat-eating monster.