Even the fat one trusts it
I have two cats, one small thin normal sized, the other fat and barrel-chested. The little one jumps and loves to play, but the fat one has to slowly calculate every jump he makes, and if he thinks that something isn't study enough, he won't go for it. It takes him a long time to trust cat trees, especially if there is jumping involved. But this one is so sturdy that he just leaps up and boom, comfy place to sleep.