Joined/attached this with the Cat Run Play Pen, so that I can put food, water & kitty litter out in that section for them, where they can get out off the sun. While, this section allows them, to jump to different levels, & see things from various heights. I also put out some of their favourite toys & gang some various string/rope items for them. They love!! I love it! Have had it for 2 years now. Through 2 northern Canadian winters. It lasts.
Item does takes time to assemble. More than one person also, not for faint of heart, but worth it once assembled.