The unfortunate result of this testing procedure in Joey's case is that he just happened to be in the room when I first plugged in the unit, and his initial reaction was to run away in fright. (Joey definitely falls into the category of "timid or skittish" cats.) We've had the Litter-Robot for two weeks as of this review, and Joey is demonstrating increased interest in this new litter box his housemates are using. He watches them enter and exit, and when the globe starts to cycle, instead of running away, moves in closer to inspect. I think it will just be a matter of time before he is a confirmed regular user too.