You know, these look pretty nifty. I'd heard they get confused easily--you know, working themselves into tight spots and unable to maneuver themselves out of them--but these clips suggest otherwise. I think at least two of my dogs would want to kill the thing, though, and I'd hate to spend $150 or so on a dog toy. Nevertheless, with my loathing of all things houseworkery, maybe an experiment would be worth it.
I'd still prefer to have a loyal, dignified servant. Ideally, Farah (from Out of Africa). Jeeves would be a little too judgmental, I think.