Now, do your cats simply understand "come here" or do they respond to it also? When I say that to any of my cats, they look at me with a "why should I" look on their faces and wait for me to give a reason. So then I have to say "treats" or "play" or "cuddles" or whatever. Depending on their mood, they either jump down right away or sit forward with a "tell me more" kind of expression. Getting them to rush off is much easier than getting them to come forward - oh dear! does that make me a guardian ogre?