Getting a Litter-Robot 4 is the best purchase I’ve ever made. Wallet is still hurting a bit, but I have no regrets. Replaced 2 smelly litter boxes in my apartment with something that just sends me a notification once a week to empty the bin. It even tracks my cats weights, so it tells me who used the litter box, along with a chart of their weight.
The Z Fold has a side button scanner as well; it’s easily one of my favorite features