Bought this for my little sister. She loves it dearly, throws a tantrum whenever I tell her to get off it. There are many challenges to complete, as you do so - it unlocks extra content such as new clothes to dress up your pet, new toys, etc.
I guess my only issues, are that at times the controller isn't very responsive especially when pointing directly at the pet. Also it would've been nice to have different kinds of pets - a puppy, a cat, a goldfish.
This is the game to get for your kids.