There is no beta out, only the Developers build. Personally I would not use it as a main OS until Beta is out, but I do have it on my netbook and it runs fine. I did try it on my desktop, and it works very well for something that is pre-beta, but it is not ready for prime time yet.
But yes, download it, play with it, see if you like it, but I would not depend on it for my main OS until Beta or RC1 like I did with win7.