It took some getting used to. The only problems I had with it was getting them used to it at first, and letting it get over filled, with poop and pee, or even just over filling the litter. I also am semi dumb and have a hard time putting the bags in. So I switched to the store brand 13 gal kitchen kind. Ya way bigger, but it is easier for me to get it in the correct way. I did get the one without the window this time, because I don't like the window. It takes up room, my cats don't ever seem to "use" it and if wet litter gets under the lip of the window you can't get it out and it can smell.