Just got this today and got it together in 10-15 mins. Brought our cat up to inspect and she immediately went inside and hasn't come out yet. I think she likes it so far, but you know how cats are! The only thing I wish was different is that it had a step or platform for her to use to help get to the opening. The opening is approx. 30" off the floor and she will have to precisely jump thru the opening to get in.