I have three cats who consistently tracked litter from the laundry room, where their litter box is, into the hallway and beyond.  I have hardwood floors and the tracked litter was visible, as well as annoying when walking barefoot.  I've tried several different litter containers and mats, but they seemed to "jump" over the mats when exiting.  This new box requires them to zig-zag when exiting.  I put a small mat at the opening and now have NO tracked litter. THANK YOU...!!  -  PS:  I assembled it by myself.  The instructions recommended two people when attaching the lid.  I just propped the lit up on a chair while attaching to the box and had no problem.