My 5 yr. old loves Moo. Who needs real hamsters?! In general they're very cute, cuter and funner than I would've thought. Even saw some teenage boys having fun with them! The only problem is that they go thru batteries pretty fast. Also, the sets do not come with enough extra connectors (which is necessary when connecting multiple sets as shown in pictures) and there is no resource for buying extra connectors, even after contacting Cepia. They are supposed to be adding a link where you buy the connector and proceeds go to charity but haven't seen that yet.