I have 4 cats and only one uses it, mostly the pouches that stick out. I found out that it is too tall, my cats cant get to the top without me boosting them up and then they fall off.

The picture shows the ladders going up to the condos, but no matter how I turn the parts, the ladders go up underneath the condo so they cant go inside. Maybe Ill take it aprt and see what I did wrong, but if I move something, theen the door to the condo faces away.

As for falling over as mentioned below, I have 2 boxes of cat litter on the bottom of mine.