The bottom where the doors are didn't have all the holes, so I had to drill two of them but otherwise my 7 yo indoor cat loves it. She uses the bottom for her bathroom and eats and drinks in the dining area. She's gotten used to the level above that but hasn't gone all the way up yet. I'm sure once more time goes by, she will. My second younger cat hasn't used it yet, although she is curious. I feed her near it so she becomes familiar with it. I've seen her sniffing it out, but has yet to go on it or use it's features.