My son adores his ZuZu. We have owned three of these little hedgehogs in the past three months because they are SO realistic that my dogs attack them if they appear in their line of sight. Lol. Quite an expensive snack. We now have special dog-free areas for ZuZu to play, including a hiding place for when my son is done playing with her. We don't have any others or any of the accessories,but my son loves watching her "zip" around his room.
* Edited on 10/4/11 to add:
Beware of hair! The sticker on each ZhuZhu pet says this,but I had no idea now sensitive these toys really were. My son only plays with his ZhuZhu pet in his room, but it was enough for it to accumulate fuzz around the wheels. After taking the entire damn thing apart and picking out every last bit of hair and fuzz (a two hour process), it still doesn't work. I won't be buying anymore of these.