We travel a lot and this unit is a blessing for those times when we are away and a friend catsits our 3 felines. Since the food and water systems are already automated for them, it made sense to automate their toilet facilities. This makes for pleasant visits.....playing rather than cleaning litter boxes. When we first got the unit, we set it up and wiped the interior of the bowl with a little cat urine on a paper towel. The cats took to the unit immediately.....they showed interest in its cleaning cycles, but weren't in any way frightened. We use the scented products with it.....It has become a 'two fer' ....not only does their cat room smell clean and sweet, but so does our bathroom (next door to their unit) every time a cycle is over. It's the best purchase we''ve made so far for our babies!