I review cat products like self-cleaning litter boxes and cat litter for a living, but it took me a minute to set up the Litter-Robot 4 in my own home due to space issues.

Philip says: "It takes up more room than I expected, but the capacity is very good." Litter-Robot 4 5-star rating Jo says: "I have two indoor cats - one of which is a rather big girl, weighing 5.5kg.