It shouldn't destroy anything. But keep in mind its new. Software can only be bug tested and stress tested so much before it hits the market. If it were a new web browser I would download it, but I do not know about an os (well major change).
Ps anyone notice in mozilla when you start typeing into the address bar then click a url that pops up it does not fill in the url you clicked in the address bar and proceeds to redirect you to what you started to typed. For example, I type http://f and it will popup forums.webdeveloper.com, but I click that and all of a sudden I get connection refused at www.f.com.... Annoying bug.