The use of the LitterMaid LM520 produces a noticeable noise that can initially scare cats. However, after about a week of use, it becomes more of an entertainment feature to them. Some users say that the noise wakes them up at night but this can be remedied by the proper placement of the litter box.
There are other similar products available in the market but so far the LitterMaid litter boxes have earned better feedbacks than the its competitors. It can use some improvements and modifications which are continuously being done by its manufacturer. As of now, it is the closest thing a cat owner can have to a maintenance-free litter box.