When you use the litter bags it’s easy to change. Easy to scoop out & flush the “number twos”. But you go through a LOT of litter so it gets expensive quickly. With two cats I was using up a 30L bag every 3-4 days. Required changing out for clean litter daily. This used up my entire rubbish bin allocation and more. I just can’t justify the amount of litter we went through so I’ve swapped to a clay clumping litter.