I have been using these boxes for many years. I have had three maybe four. After awhile they just did not work, usually past the warranty.
I know they could probably be fixed but not worth my time and effort and cost to ship it back for repair. I tried an elite.
I hated it so I stored it in the basement. Now my latest mega box stopped working and I don't see them readily available locally anymore. I took out the old elite and set it up. It works, just doesn't get very far... Could be my litter clumps too much, but I hate it.
Nothing gets deposited in the box. The littermaid mega box when it worked was adequate for three or four cats. I did have to clean it everyday and as I said not ideal.
I don't know that anyone makes an ideal one. I just know I am NOT happy now and I hate not having a working automatic box. Even though the mega box was not all that thorough, it did scrap u a fair amount of waste into the box.
I used a third party box that was bigger an easier to care for, but that is another problem when using other models.