Not ideal for older multi cat households but good concept..
The idea is great, the video clear and the kit works well enough but unfortunately only one of my two old rescue cats was prepared to consider change, ie jumping up to use the Stage 1 litter tray on top of the loo seat. Sadly, the other boy refused to consider this and instead started to mess on the bathroom floor. After a couple of weeks of progress with one cat I had to abandon Litter Kwitter. I'd happily try it again with a younger cat.