Bought a litter robot 4, wouldn’t do it again for the price. It’s a pain to clean and the cats are always peeing/pooping on the sides. It constantly stopped it cleaning cycle, and ended up growing a ton of bugs inside because the design had some cat poop inside the machine where I couldn’t get to it. I had to dismantle the entire thing taking out every screw to clean it. It’s currently sitting in my basement. I left a similar review on their website and they decided not to post it, I guess they don’t like unfavorable reviews.