The must? The Furby Boom developed its personality under the care and attention that the child will bring him. Me, it makes me think of Gizmo (the nice Gremlins) :-) Your little pieces will crack at this hairball. Using sensors, the Furby perceive tickling on her stomach, caressing the back, react to music, etc ... There is a real interactivity. For cons, I advise it from 7-8 years because if we do not deal well, he will become evil -D Grosse voice, flashes in the eyes, bad mood, etc. (Of course all contribute to the charm but you will then have a Gizmo grumpy ;-)) Once in hand, your children will leave no more, you can be sure.