I know it is a cliche by now, but all Zhu-Zhu pets range is horribly overpriced and short-term interest. Excitment when opening the box, then boredom and demands to buy more characters. These babies are tiny plastic things and do not even do anything (more fun than hamsters though). For less than half the price my daughter has more fun with e.g. Little Ponies.
Having said that, we still bought it for our daughter's birthday. Because she did not want anything else. What won't you do to get a bit of quiet...