Litter Robot 4 review: A great, but imperfect, self-cleaning litter box

Now that I'm dealing with three cats, an 11-month old's diapers and potty time with my four-year old, I just needed some relief from mountains of excrement. Enter the Litter Robot 4, the latest iteration of Whisker's automated litter box (a product we initially covered in 2005!). It's a small, spaceship-looking device that automatically rotates after your cat does its business, separating waste into a storage bin and leaving the remaining clean litter behind. Instead of scooping a box daily (or several times a day for multi-cat households), you only need to yank out the Litter Robot's bin bag and replace it with a new liner once a week. Sounds like a dream, right?