So, my cat loves to hunt. Spinning toys are boring, rope swing toys are too predictable, and squish balls are made for dogs. However, this catches her attention and keeps her in suspense. The mouse's intelligent "pause" really helps create the illusion that this is a real walking creature. It corrects itself when knocked over, and the ears sometimes prevent it from going under certain things (where it can get lost). The only criticism is that the engine hums quite loudly. This is somewhat normal as it is a tiny, battery powered spin motor. It's just a characteristic of such things. But like I said, this is a great little toy for the hunter in your life. Warning: If you have a Roomba, don't forget to bring your mouse with you after playing. Time. Apparently even vacuum cleaner robots like the taste of this hex mouse.