Our petite, shy senior rescue loves this. She played with it heavily the first couple of days but now just walks through it periodically. Nonetheless, she likes it. NOTE: She is indeed petite, only 6.1#.
Our larger, more average sized cat (10-11#) won't even enter it; it is too small/narrow for him.
Therefore, I do not recommend this for large cats such as Maine Coones, Rag Dolls, large Tabbies, etc.