I have a webkin. Sometimes it gets boring, but most of the time it is fun. One of my sister's friends is obsessed with it. It's your choice. I really think they are worth it.
For the demo, there isn't a demo. You have to have a webkinz in order to access into "Webkinz World". You have to go to "Adopt a New Pet". Give out a few personal information things. Create a Username and a Password and you are ready to go. Then get the code off your tag and type it in when it tells you to. Oh, you can only go on Internet Explorer at Webkinz.com It won't work on Firefox, so don't waste your time trying.
//TamaPATCHI