It's amazing that a litter box so simple in design could be so great! We have two cats, one who is about 10 years old, and the baby who is almost 2. The younger didn't have a problem at all getting in and pooping it up, but it did take a few days for the old man to get the hang of things. I had been researching litter boxes for almost a year and the final straw was the failed Littermaid. Since having the Modkat we have seen 99.9999% litter tracking reduction, which saves lots of time because there is no longer a need to constantly sweep. We use a premium clumping litter with a scent just because we do have 2 stinky boys, but i am confident that if we used unscented that this box would be able to contain the odor until scooping. AND the scooping is so easy. Removing the lid is easy, the scooper that comes with the Modkat makes getting in the corners easy and the holes in the scooper are big enough to let litter fall back through but s mall enough that even the smaller waste clumps are caught.