I normally don't like to play w/ new frameworks on the block.. but I heard some buzz about "JavaScriptMVC"

As of now... I'm still very unsure about pushing mvc pattern to JavaScript. Still, I really like their testing package. Does anyone use this? or think this approach is not right? I'm very skeptical at this point but it's only because it introduce new way of thinking.

their site is http://javascriptmvc.com