If you about 15 gb of free space I suggest you dl it and try it out. Looks and acts good so far from what I seen. It's got Digital Rights Management all over it. So install it on a separate partition so You can have the option of choosing between XP(or whatever) and Vista. It makes XP look like an ancient dinosaur. They are giving Vista beta2 as free download.
http://www.microsoft.com/Windowsvista/
http://www.microsoft.com/Windowsvista/