I have not tried it out yet but it looks sweet! Not too expensive to upgrade so I might get it, I feel like it looks more like the iPad, iPhone, iTouch kind of idea with the apps and stuff on the screen and how everything moves. I saw somewhere there is over 200 or 250 new features? Not too sure how useful all the new features are though.
I downloaded it from the app store on Thursday. I love it, it has the look and feel of working on an iPad or an iPhone. It will be real cool is you have the optional track pad or the magic mouse. All the same gestures you use on the iPhone and iPad are able to be done with a track pad or magic mouse. I think its awesome.