Without being excessive, the size of it is suitable for standard gauge cats, downright coated. They can climb the perches and lie down, it overflows a little but it did not seem to bother them too much.
Two of my cats do not even seem to notice that their tree had changed (the previous one was smashed yet); the third is safer, but it took almost 1 year to get on the other, so I'm not worried.
Happy with my purchase, I recommend.