Has been a little over a month since getting both cats to use the Litter Robot. Definitely uses less litter than the Litter Maid it replaced. May even use less than hand scooping.
We've found that the Litter-Robot controls odors on it's own fairly well, but have found if you sprinkle a table spoon or two of baking soda into the litter and into a clean liner each time odors are all but eliminated.
Marty