My boy cat pees high. I went through at least five boxes in two years and all of them leaked at the seams or were awkward until the Modkat. The large box is big, and both my cats favor it. The long lasting liners are great, saving money and reducing plastic over the long run. I went for the large that lets me change to a front entry if my older cat starts having trouble with the top entry but for now, it's top for the win, offering privacy and almost eliminating tracking!
