I purchased this in white instead of black (the only place online I've been able to find it in white) to fit in with the white/light gray colors of my apartment and patio. I bought it so my cats could go safely sit in the patio area and get some sun and fresh air without getting into trouble. I bought the tallest size and it is working well so far (but my cats are elderly and chubby. I can't guarantee younger cats wouldn't escape.)  It was easy to put together and it doesn't look too ugly (no complaints from the apartment management so far.)