Zwift interactive training?

Saw this on Performancebike and it looks interesting. I don’t have an interactive trainer but can get one if this is worth the time. I have a spinner in the basement but I’d rather have something more “real” and this might be it:

http://zwift.com/

Anyone try this out? Let me hear some opinions.

My friend has used this loves it. Your riding with people world wide.
I tried it had a great time .

Well If I try it out I’ll let you guys know what I think.