I bought this Playpen to use in my rescue. We can place a cat(s) in them and it allows the resident cats to see and smell the newbies and vice versa, without fear of any fights breaking out. The cats love the vertical height because they can go on the top shelf and watch everything. We set the litter box on the bottom, with the food and water bowls on the right middle shelf (we use coup cups to maximize space). We usually cover the top, sides, and back for privacy. The only downside is that some of the latches do not latch easily (you have to align and push down a little harder...nothing major), and it is a two person job when it comes to assemble, again nothing major. Those are the only reasons I gave it 4 stars. Other than that it is an excellent buy for the money, especially for a rescue who has limited resources.